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Finding the Fourth Proportional to 757.62, 1,045.50 and 478.02

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Solution

The fourth proportional to 757.62, 1,045.50 and 478.02 is: 659.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.62 : 1,045.50 = 478.02 : x
  2. Step 2: Convert to fraction form
    757.62/1,045.50 = 478.02/x
  3. Step 3: Cross multiply
    757.62x = 1,045.50 × 478.02
  4. Step 4: Simplify right side
    757.62x = 499,769.91
  5. Step 5: Solve for x
    x = 499,769.91/757.62
  6. Step 6: Final answer
    x = 659.66

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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.