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Finding the Fourth Proportional to 42,369.84, 63,555.18 and 12,787.92

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Solution

The fourth proportional to 42,369.84, 63,555.18 and 12,787.92 is: 19,182.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,369.84 : 63,555.18 = 12,787.92 : x
  2. Step 2: Convert to fraction form
    42,369.84/63,555.18 = 12,787.92/x
  3. Step 3: Cross multiply
    42,369.84x = 63,555.18 × 12,787.92
  4. Step 4: Simplify right side
    42,369.84x = 812,738,239.65
  5. Step 5: Solve for x
    x = 812,738,239.65/42,369.84
  6. Step 6: Final answer
    x = 19,182.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.