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Finding the Fourth Proportional to 15,159.89, 20,920.67 and 8,787.71

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Solution

The fourth proportional to 15,159.89, 20,920.67 and 8,787.71 is: 12,127.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.89 : 20,920.67 = 8,787.71 : x
  2. Step 2: Convert to fraction form
    15,159.89/20,920.67 = 8,787.71/x
  3. Step 3: Cross multiply
    15,159.89x = 20,920.67 × 8,787.71
  4. Step 4: Simplify right side
    15,159.89x = 183,844,822.28
  5. Step 5: Solve for x
    x = 183,844,822.28/15,159.89
  6. Step 6: Final answer
    x = 12,127.05

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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.