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Finding the Fourth Proportional to 317,937.64, 476,905.50 and 81,280.36

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Solution

The fourth proportional to 317,937.64, 476,905.50 and 81,280.36 is: 121,920.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,937.64 : 476,905.50 = 81,280.36 : x
  2. Step 2: Convert to fraction form
    317,937.64/476,905.50 = 81,280.36/x
  3. Step 3: Cross multiply
    317,937.64x = 476,905.50 × 81,280.36
  4. Step 4: Simplify right side
    317,937.64x = 38,763,050,725.98
  5. Step 5: Solve for x
    x = 38,763,050,725.98/317,937.64
  6. Step 6: Final answer
    x = 121,920.29

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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.