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Finding the Fourth Proportional to 753.40, 1,129.62 and 479.56

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Solution

The fourth proportional to 753.40, 1,129.62 and 479.56 is: 719.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.40 : 1,129.62 = 479.56 : x
  2. Step 2: Convert to fraction form
    753.40/1,129.62 = 479.56/x
  3. Step 3: Cross multiply
    753.40x = 1,129.62 × 479.56
  4. Step 4: Simplify right side
    753.40x = 541,720.57
  5. Step 5: Solve for x
    x = 541,720.57/753.40
  6. Step 6: Final answer
    x = 719.03

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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.