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Finding the Fourth Proportional to 937.89, 1,407.33 and 390.11

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Solution

The fourth proportional to 937.89, 1,407.33 and 390.11 is: 585.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.89 : 1,407.33 = 390.11 : x
  2. Step 2: Convert to fraction form
    937.89/1,407.33 = 390.11/x
  3. Step 3: Cross multiply
    937.89x = 1,407.33 × 390.11
  4. Step 4: Simplify right side
    937.89x = 549,006.47
  5. Step 5: Solve for x
    x = 549,006.47/937.89
  6. Step 6: Final answer
    x = 585.36

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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.