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Finding the Fourth Proportional to 15,694.76, 21,660.68 and 9,070.76

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Solution

The fourth proportional to 15,694.76, 21,660.68 and 9,070.76 is: 12,518.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.76 : 21,660.68 = 9,070.76 : x
  2. Step 2: Convert to fraction form
    15,694.76/21,660.68 = 9,070.76/x
  3. Step 3: Cross multiply
    15,694.76x = 21,660.68 × 9,070.76
  4. Step 4: Simplify right side
    15,694.76x = 196,478,829.72
  5. Step 5: Solve for x
    x = 196,478,829.72/15,694.76
  6. Step 6: Final answer
    x = 12,518.75

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Half scale
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Double scale
Find fourth proportional to 15,695.76, 21,662.06 and 9,071.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.