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Finding the Fourth Proportional to 913.95, 1,370.61 and 426.69

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Solution

The fourth proportional to 913.95, 1,370.61 and 426.69 is: 639.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.95 : 1,370.61 = 426.69 : x
  2. Step 2: Convert to fraction form
    913.95/1,370.61 = 426.69/x
  3. Step 3: Cross multiply
    913.95x = 1,370.61 × 426.69
  4. Step 4: Simplify right side
    913.95x = 584,825.58
  5. Step 5: Solve for x
    x = 584,825.58/913.95
  6. Step 6: Final answer
    x = 639.89

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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.