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Finding the Fourth Proportional to 753.12, 1,039.46 and 487.89

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Solution

The fourth proportional to 753.12, 1,039.46 and 487.89 is: 673.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.12 : 1,039.46 = 487.89 : x
  2. Step 2: Convert to fraction form
    753.12/1,039.46 = 487.89/x
  3. Step 3: Cross multiply
    753.12x = 1,039.46 × 487.89
  4. Step 4: Simplify right side
    753.12x = 507,139.70
  5. Step 5: Solve for x
    x = 507,139.70/753.12
  6. Step 6: Final answer
    x = 673.38

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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.