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Finding the Fourth Proportional to 913.13, 1,370 and 426.52

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Solution

The fourth proportional to 913.13, 1,370 and 426.52 is: 639.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.13 : 1,370 = 426.52 : x
  2. Step 2: Convert to fraction form
    913.13/1,370 = 426.52/x
  3. Step 3: Cross multiply
    913.13x = 1,370 × 426.52
  4. Step 4: Simplify right side
    913.13x = 584,332.40
  5. Step 5: Solve for x
    x = 584,332.40/913.13
  6. Step 6: Final answer
    x = 639.92

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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.