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Finding the Fourth Proportional to 785.92, 1,085.04 and 553.28

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Solution

The fourth proportional to 785.92, 1,085.04 and 553.28 is: 763.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.92 : 1,085.04 = 553.28 : x
  2. Step 2: Convert to fraction form
    785.92/1,085.04 = 553.28/x
  3. Step 3: Cross multiply
    785.92x = 1,085.04 × 553.28
  4. Step 4: Simplify right side
    785.92x = 600,330.93
  5. Step 5: Solve for x
    x = 600,330.93/785.92
  6. Step 6: Final answer
    x = 763.86

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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.