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Finding the Fourth Proportional to 757.89, 1,045.51 and 478.04

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Solution

The fourth proportional to 757.89, 1,045.51 and 478.04 is: 659.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.89 : 1,045.51 = 478.04 : x
  2. Step 2: Convert to fraction form
    757.89/1,045.51 = 478.04/x
  3. Step 3: Cross multiply
    757.89x = 1,045.51 × 478.04
  4. Step 4: Simplify right side
    757.89x = 499,789.18
  5. Step 5: Solve for x
    x = 499,789.18/757.89
  6. Step 6: Final answer
    x = 659.45

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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.