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Finding the Fourth Proportional to 817.93, 1,128.09 and 660.52

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Solution

The fourth proportional to 817.93, 1,128.09 and 660.52 is: 910.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.93 : 1,128.09 = 660.52 : x
  2. Step 2: Convert to fraction form
    817.93/1,128.09 = 660.52/x
  3. Step 3: Cross multiply
    817.93x = 1,128.09 × 660.52
  4. Step 4: Simplify right side
    817.93x = 745,126.01
  5. Step 5: Solve for x
    x = 745,126.01/817.93
  6. Step 6: Final answer
    x = 910.99

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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.