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Finding the Fourth Proportional to 21,787.92, 30,068.04 and 12,356.88

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Solution

The fourth proportional to 21,787.92, 30,068.04 and 12,356.88 is: 17,052.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787.92 : 30,068.04 = 12,356.88 : x
  2. Step 2: Convert to fraction form
    21,787.92/30,068.04 = 12,356.88/x
  3. Step 3: Cross multiply
    21,787.92x = 30,068.04 × 12,356.88
  4. Step 4: Simplify right side
    21,787.92x = 371,547,162.12
  5. Step 5: Solve for x
    x = 371,547,162.12/21,787.92
  6. Step 6: Final answer
    x = 17,052.90

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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.