Home / 1,292.59-1,938.85-318.70

Finding the Fourth Proportional to 1,292.59, 1,938.85 and 318.70

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Solution

The fourth proportional to 1,292.59, 1,938.85 and 318.70 is: 478.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.59 : 1,938.85 = 318.70 : x
  2. Step 2: Convert to fraction form
    1,292.59/1,938.85 = 318.70/x
  3. Step 3: Cross multiply
    1,292.59x = 1,938.85 × 318.70
  4. Step 4: Simplify right side
    1,292.59x = 617,911.50
  5. Step 5: Solve for x
    x = 617,911.50/1,292.59
  6. Step 6: Final answer
    x = 478.04

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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.