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Finding the Fourth Proportional to 938.76, 1,407.16 and 391.26

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Solution

The fourth proportional to 938.76, 1,407.16 and 391.26 is: 586.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.76 : 1,407.16 = 391.26 : x
  2. Step 2: Convert to fraction form
    938.76/1,407.16 = 391.26/x
  3. Step 3: Cross multiply
    938.76x = 1,407.16 × 391.26
  4. Step 4: Simplify right side
    938.76x = 550,565.42
  5. Step 5: Solve for x
    x = 550,565.42/938.76
  6. Step 6: Final answer
    x = 586.48

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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.