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Finding the Fourth Proportional to 725.40, 1,000.48 and 666.56

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Solution

The fourth proportional to 725.40, 1,000.48 and 666.56 is: 919.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.40 : 1,000.48 = 666.56 : x
  2. Step 2: Convert to fraction form
    725.40/1,000.48 = 666.56/x
  3. Step 3: Cross multiply
    725.40x = 1,000.48 × 666.56
  4. Step 4: Simplify right side
    725.40x = 666,879.95
  5. Step 5: Solve for x
    x = 666,879.95/725.40
  6. Step 6: Final answer
    x = 919.33

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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.