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Finding the Fourth Proportional to 753.90, 1,039.23 and 520.62

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Solution

The fourth proportional to 753.90, 1,039.23 and 520.62 is: 717.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.90 : 1,039.23 = 520.62 : x
  2. Step 2: Convert to fraction form
    753.90/1,039.23 = 520.62/x
  3. Step 3: Cross multiply
    753.90x = 1,039.23 × 520.62
  4. Step 4: Simplify right side
    753.90x = 541,043.92
  5. Step 5: Solve for x
    x = 541,043.92/753.90
  6. Step 6: Final answer
    x = 717.66

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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.