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Finding the Fourth Proportional to 1,064.90, 1,469.43 and 616.78

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Solution

The fourth proportional to 1,064.90, 1,469.43 and 616.78 is: 851.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,064.90 : 1,469.43 = 616.78 : x
  2. Step 2: Convert to fraction form
    1,064.90/1,469.43 = 616.78/x
  3. Step 3: Cross multiply
    1,064.90x = 1,469.43 × 616.78
  4. Step 4: Simplify right side
    1,064.90x = 906,310.00
  5. Step 5: Solve for x
    x = 906,310.00/1,064.90
  6. Step 6: Final answer
    x = 851.08

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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.