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Finding the Fourth Proportional to 938.35, 1,407.68 and 390.56

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Solution

The fourth proportional to 938.35, 1,407.68 and 390.56 is: 585.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.35 : 1,407.68 = 390.56 : x
  2. Step 2: Convert to fraction form
    938.35/1,407.68 = 390.56/x
  3. Step 3: Cross multiply
    938.35x = 1,407.68 × 390.56
  4. Step 4: Simplify right side
    938.35x = 549,775.97
  5. Step 5: Solve for x
    x = 549,775.97/938.35
  6. Step 6: Final answer
    x = 585.90

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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.