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Finding the Fourth Proportional to 938.90, 1,407.75 and 499.88

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Solution

The fourth proportional to 938.90, 1,407.75 and 499.88 is: 749.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.90 : 1,407.75 = 499.88 : x
  2. Step 2: Convert to fraction form
    938.90/1,407.75 = 499.88/x
  3. Step 3: Cross multiply
    938.90x = 1,407.75 × 499.88
  4. Step 4: Simplify right side
    938.90x = 703,702.55
  5. Step 5: Solve for x
    x = 703,702.55/938.90
  6. Step 6: Final answer
    x = 749.50

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1.5x scale

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.