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Finding the Fourth Proportional to 729.32, 1,005.69 and 624.75

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Solution

The fourth proportional to 729.32, 1,005.69 and 624.75 is: 861.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.32 : 1,005.69 = 624.75 : x
  2. Step 2: Convert to fraction form
    729.32/1,005.69 = 624.75/x
  3. Step 3: Cross multiply
    729.32x = 1,005.69 × 624.75
  4. Step 4: Simplify right side
    729.32x = 628,304.83
  5. Step 5: Solve for x
    x = 628,304.83/729.32
  6. Step 6: Final answer
    x = 861.49

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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.