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Finding the Fourth Proportional to 102,787.80, 154,340.10 and 56,131.80

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Solution

The fourth proportional to 102,787.80, 154,340.10 and 56,131.80 is: 84,284.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,787.80 : 154,340.10 = 56,131.80 : x
  2. Step 2: Convert to fraction form
    102,787.80/154,340.10 = 56,131.80/x
  3. Step 3: Cross multiply
    102,787.80x = 154,340.10 × 56,131.80
  4. Step 4: Simplify right side
    102,787.80x = 8,663,387,625.18
  5. Step 5: Solve for x
    x = 8,663,387,625.18/102,787.80
  6. Step 6: Final answer
    x = 84,284.20

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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.