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Finding the Fourth Proportional to 317.70, 476.15 and 291.78

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Solution

The fourth proportional to 317.70, 476.15 and 291.78 is: 437.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.70 : 476.15 = 291.78 : x
  2. Step 2: Convert to fraction form
    317.70/476.15 = 291.78/x
  3. Step 3: Cross multiply
    317.70x = 476.15 × 291.78
  4. Step 4: Simplify right side
    317.70x = 138,929.59
  5. Step 5: Solve for x
    x = 138,929.59/317.70
  6. Step 6: Final answer
    x = 437.30

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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.