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Finding the Fourth Proportional to 15,685.76, 21,643.52 and 8,879.74

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Solution

The fourth proportional to 15,685.76, 21,643.52 and 8,879.74 is: 12,252.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.76 : 21,643.52 = 8,879.74 : x
  2. Step 2: Convert to fraction form
    15,685.76/21,643.52 = 8,879.74/x
  3. Step 3: Cross multiply
    15,685.76x = 21,643.52 × 8,879.74
  4. Step 4: Simplify right side
    15,685.76x = 192,188,798.38
  5. Step 5: Solve for x
    x = 192,188,798.38/15,685.76
  6. Step 6: Final answer
    x = 12,252.44

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Half scale
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Double scale
Find fourth proportional to 15,686.76, 21,644.90 and 8,880.74
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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.