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Finding the Fourth Proportional to 723.80, 999.30 and 689.32

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Solution

The fourth proportional to 723.80, 999.30 and 689.32 is: 951.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.80 : 999.30 = 689.32 : x
  2. Step 2: Convert to fraction form
    723.80/999.30 = 689.32/x
  3. Step 3: Cross multiply
    723.80x = 999.30 × 689.32
  4. Step 4: Simplify right side
    723.80x = 688,837.48
  5. Step 5: Solve for x
    x = 688,837.48/723.80
  6. Step 6: Final answer
    x = 951.70

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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.