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Finding the Fourth Proportional to 15,661.14, 21,612.99 and 8,587.81

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Solution

The fourth proportional to 15,661.14, 21,612.99 and 8,587.81 is: 11,851.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.14 : 21,612.99 = 8,587.81 : x
  2. Step 2: Convert to fraction form
    15,661.14/21,612.99 = 8,587.81/x
  3. Step 3: Cross multiply
    15,661.14x = 21,612.99 × 8,587.81
  4. Step 4: Simplify right side
    15,661.14x = 185,608,251.65
  5. Step 5: Solve for x
    x = 185,608,251.65/15,661.14
  6. Step 6: Final answer
    x = 11,851.52

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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.