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Finding the Fourth Proportional to 1,008.70, 1,391.91 and 566.50

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Solution

The fourth proportional to 1,008.70, 1,391.91 and 566.50 is: 781.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.70 : 1,391.91 = 566.50 : x
  2. Step 2: Convert to fraction form
    1,008.70/1,391.91 = 566.50/x
  3. Step 3: Cross multiply
    1,008.70x = 1,391.91 × 566.50
  4. Step 4: Simplify right side
    1,008.70x = 788,517.02
  5. Step 5: Solve for x
    x = 788,517.02/1,008.70
  6. Step 6: Final answer
    x = 781.72

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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.