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Finding the Fourth Proportional to 499.40, 748.37 and 391.05

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Solution

The fourth proportional to 499.40, 748.37 and 391.05 is: 586.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.40 : 748.37 = 391.05 : x
  2. Step 2: Convert to fraction form
    499.40/748.37 = 391.05/x
  3. Step 3: Cross multiply
    499.40x = 748.37 × 391.05
  4. Step 4: Simplify right side
    499.40x = 292,648.13
  5. Step 5: Solve for x
    x = 292,648.13/499.40
  6. Step 6: Final answer
    x = 586.01

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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.