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Finding the Fourth Proportional to 817.52, 1,126.98 and 640.17

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Solution

The fourth proportional to 817.52, 1,126.98 and 640.17 is: 882.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.52 : 1,126.98 = 640.17 : x
  2. Step 2: Convert to fraction form
    817.52/1,126.98 = 640.17/x
  3. Step 3: Cross multiply
    817.52x = 1,126.98 × 640.17
  4. Step 4: Simplify right side
    817.52x = 721,458.79
  5. Step 5: Solve for x
    x = 721,458.79/817.52
  6. Step 6: Final answer
    x = 882.50

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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.