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Finding the Fourth Proportional to 753.10, 1,039.17 and 491.20

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Solution

The fourth proportional to 753.10, 1,039.17 and 491.20 is: 677.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.10 : 1,039.17 = 491.20 : x
  2. Step 2: Convert to fraction form
    753.10/1,039.17 = 491.20/x
  3. Step 3: Cross multiply
    753.10x = 1,039.17 × 491.20
  4. Step 4: Simplify right side
    753.10x = 510,440.30
  5. Step 5: Solve for x
    x = 510,440.30/753.10
  6. Step 6: Final answer
    x = 677.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.