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Finding the Fourth Proportional to 898.14, 1,239.57 and 646.91

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Solution

The fourth proportional to 898.14, 1,239.57 and 646.91 is: 892.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.14 : 1,239.57 = 646.91 : x
  2. Step 2: Convert to fraction form
    898.14/1,239.57 = 646.91/x
  3. Step 3: Cross multiply
    898.14x = 1,239.57 × 646.91
  4. Step 4: Simplify right side
    898.14x = 801,884.03
  5. Step 5: Solve for x
    x = 801,884.03/898.14
  6. Step 6: Final answer
    x = 892.83

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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.