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Finding the Fourth Proportional to 938.46, 1,407.39 and 390.35

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Solution

The fourth proportional to 938.46, 1,407.39 and 390.35 is: 585.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.46 : 1,407.39 = 390.35 : x
  2. Step 2: Convert to fraction form
    938.46/1,407.39 = 390.35/x
  3. Step 3: Cross multiply
    938.46x = 1,407.39 × 390.35
  4. Step 4: Simplify right side
    938.46x = 549,374.69
  5. Step 5: Solve for x
    x = 549,374.69/938.46
  6. Step 6: Final answer
    x = 585.40

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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.