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Finding the Fourth Proportional to 937.85, 1,406.84 and 390.15

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Solution

The fourth proportional to 937.85, 1,406.84 and 390.15 is: 585.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.85 : 1,406.84 = 390.15 : x
  2. Step 2: Convert to fraction form
    937.85/1,406.84 = 390.15/x
  3. Step 3: Cross multiply
    937.85x = 1,406.84 × 390.15
  4. Step 4: Simplify right side
    937.85x = 548,876.68
  5. Step 5: Solve for x
    x = 548,876.68/937.85
  6. Step 6: Final answer
    x = 585.25

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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.