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Finding the Fourth Proportional to 1,291.76, 1,937.61 and 317.86

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Solution

The fourth proportional to 1,291.76, 1,937.61 and 317.86 is: 476.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.76 : 1,937.61 = 317.86 : x
  2. Step 2: Convert to fraction form
    1,291.76/1,937.61 = 317.86/x
  3. Step 3: Cross multiply
    1,291.76x = 1,937.61 × 317.86
  4. Step 4: Simplify right side
    1,291.76x = 615,888.71
  5. Step 5: Solve for x
    x = 615,888.71/1,291.76
  6. Step 6: Final answer
    x = 476.78

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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.