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Finding the Fourth Proportional to 15,159.18, 20,920.86 and 8,787.84

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Solution

The fourth proportional to 15,159.18, 20,920.86 and 8,787.84 is: 12,127.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.18 : 20,920.86 = 8,787.84 : x
  2. Step 2: Convert to fraction form
    15,159.18/20,920.86 = 8,787.84/x
  3. Step 3: Cross multiply
    15,159.18x = 20,920.86 × 8,787.84
  4. Step 4: Simplify right side
    15,159.18x = 183,849,170.34
  5. Step 5: Solve for x
    x = 183,849,170.34/15,159.18
  6. Step 6: Final answer
    x = 12,127.91

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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.