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Finding the Fourth Proportional to 1,292.61, 1,938.89 and 318.71

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Solution

The fourth proportional to 1,292.61, 1,938.89 and 318.71 is: 478.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.61 : 1,938.89 = 318.71 : x
  2. Step 2: Convert to fraction form
    1,292.61/1,938.89 = 318.71/x
  3. Step 3: Cross multiply
    1,292.61x = 1,938.89 × 318.71
  4. Step 4: Simplify right side
    1,292.61x = 617,949.28
  5. Step 5: Solve for x
    x = 617,949.28/1,292.61
  6. Step 6: Final answer
    x = 478.06

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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.