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Finding the Fourth Proportional to 913.72, 1,369.94 and 426.50

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Solution

The fourth proportional to 913.72, 1,369.94 and 426.50 is: 639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.72 : 1,369.94 = 426.50 : x
  2. Step 2: Convert to fraction form
    913.72/1,369.94 = 426.50/x
  3. Step 3: Cross multiply
    913.72x = 1,369.94 × 426.50
  4. Step 4: Simplify right side
    913.72x = 584,279.41
  5. Step 5: Solve for x
    x = 584,279.41/913.72
  6. Step 6: Final answer
    x = 639.45

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Double scale
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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.