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Finding the Fourth Proportional to 757.97, 1,045.71 and 478.01

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Solution

The fourth proportional to 757.97, 1,045.71 and 478.01 is: 659.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.97 : 1,045.71 = 478.01 : x
  2. Step 2: Convert to fraction form
    757.97/1,045.71 = 478.01/x
  3. Step 3: Cross multiply
    757.97x = 1,045.71 × 478.01
  4. Step 4: Simplify right side
    757.97x = 499,859.84
  5. Step 5: Solve for x
    x = 499,859.84/757.97
  6. Step 6: Final answer
    x = 659.47

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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.