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Finding the Fourth Proportional to 938.66, 1,407.87 and 390.74

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Solution

The fourth proportional to 938.66, 1,407.87 and 390.74 is: 586.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.66 : 1,407.87 = 390.74 : x
  2. Step 2: Convert to fraction form
    938.66/1,407.87 = 390.74/x
  3. Step 3: Cross multiply
    938.66x = 1,407.87 × 390.74
  4. Step 4: Simplify right side
    938.66x = 550,111.12
  5. Step 5: Solve for x
    x = 550,111.12/938.66
  6. Step 6: Final answer
    x = 586.06

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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.