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Finding the Fourth Proportional to 11,392.65, 15,736.68 and 8,772.30

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Solution

The fourth proportional to 11,392.65, 15,736.68 and 8,772.30 is: 12,117.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,392.65 : 15,736.68 = 8,772.30 : x
  2. Step 2: Convert to fraction form
    11,392.65/15,736.68 = 8,772.30/x
  3. Step 3: Cross multiply
    11,392.65x = 15,736.68 × 8,772.30
  4. Step 4: Simplify right side
    11,392.65x = 138,046,877.96
  5. Step 5: Solve for x
    x = 138,046,877.96/11,392.65
  6. Step 6: Final answer
    x = 12,117.19

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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.