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Finding the Fourth Proportional to 723.90, 999.40 and 557.78

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Solution

The fourth proportional to 723.90, 999.40 and 557.78 is: 770.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.90 : 999.40 = 557.78 : x
  2. Step 2: Convert to fraction form
    723.90/999.40 = 557.78/x
  3. Step 3: Cross multiply
    723.90x = 999.40 × 557.78
  4. Step 4: Simplify right side
    723.90x = 557,445.33
  5. Step 5: Solve for x
    x = 557,445.33/723.90
  6. Step 6: Final answer
    x = 770.06

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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.