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Finding the Fourth Proportional to 15,695.16, 21,659.49 and 8,621.40

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Solution

The fourth proportional to 15,695.16, 21,659.49 and 8,621.40 is: 11,897.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,695.16 : 21,659.49 = 8,621.40 : x
  2. Step 2: Convert to fraction form
    15,695.16/21,659.49 = 8,621.40/x
  3. Step 3: Cross multiply
    15,695.16x = 21,659.49 × 8,621.40
  4. Step 4: Simplify right side
    15,695.16x = 186,735,127.09
  5. Step 5: Solve for x
    x = 186,735,127.09/15,695.16
  6. Step 6: Final answer
    x = 11,897.62

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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.