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Finding the Fourth Proportional to 864.20, 1,192.50 and 689.48

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Solution

The fourth proportional to 864.20, 1,192.50 and 689.48 is: 951.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.20 : 1,192.50 = 689.48 : x
  2. Step 2: Convert to fraction form
    864.20/1,192.50 = 689.48/x
  3. Step 3: Cross multiply
    864.20x = 1,192.50 × 689.48
  4. Step 4: Simplify right side
    864.20x = 822,204.90
  5. Step 5: Solve for x
    x = 822,204.90/864.20
  6. Step 6: Final answer
    x = 951.41

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1.5x scale

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.