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Finding the Fourth Proportional to 1,008.61, 1,391.87 and 566.51

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Solution

The fourth proportional to 1,008.61, 1,391.87 and 566.51 is: 781.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.61 : 1,391.87 = 566.51 : x
  2. Step 2: Convert to fraction form
    1,008.61/1,391.87 = 566.51/x
  3. Step 3: Cross multiply
    1,008.61x = 1,391.87 × 566.51
  4. Step 4: Simplify right side
    1,008.61x = 788,502.73
  5. Step 5: Solve for x
    x = 788,502.73/1,008.61
  6. Step 6: Final answer
    x = 781.77

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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.