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Finding the Fourth Proportional to 838.24, 1,155.12 and 616.80

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Solution

The fourth proportional to 838.24, 1,155.12 and 616.80 is: 849.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.24 : 1,155.12 = 616.80 : x
  2. Step 2: Convert to fraction form
    838.24/1,155.12 = 616.80/x
  3. Step 3: Cross multiply
    838.24x = 1,155.12 × 616.80
  4. Step 4: Simplify right side
    838.24x = 712,478.02
  5. Step 5: Solve for x
    x = 712,478.02/838.24
  6. Step 6: Final answer
    x = 849.97

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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.