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Finding the Fourth Proportional to 898.61, 1,239.53 and 566.78

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Solution

The fourth proportional to 898.61, 1,239.53 and 566.78 is: 781.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.61 : 1,239.53 = 566.78 : x
  2. Step 2: Convert to fraction form
    898.61/1,239.53 = 566.78/x
  3. Step 3: Cross multiply
    898.61x = 1,239.53 × 566.78
  4. Step 4: Simplify right side
    898.61x = 702,531.78
  5. Step 5: Solve for x
    x = 702,531.78/898.61
  6. Step 6: Final answer
    x = 781.80

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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.