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Finding the Fourth Proportional to 317,780.90, 476,671.16 and 81,123.48

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Solution

The fourth proportional to 317,780.90, 476,671.16 and 81,123.48 is: 121,685.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,780.90 : 476,671.16 = 81,123.48 : x
  2. Step 2: Convert to fraction form
    317,780.90/476,671.16 = 81,123.48/x
  3. Step 3: Cross multiply
    317,780.90x = 476,671.16 × 81,123.48
  4. Step 4: Simplify right side
    317,780.90x = 38,669,222,909.22
  5. Step 5: Solve for x
    x = 38,669,222,909.22/317,780.90
  6. Step 6: Final answer
    x = 121,685.17

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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.