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Finding the Fourth Proportional to 723.48, 998.08 and 487.58

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Solution

The fourth proportional to 723.48, 998.08 and 487.58 is: 672.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.48 : 998.08 = 487.58 : x
  2. Step 2: Convert to fraction form
    723.48/998.08 = 487.58/x
  3. Step 3: Cross multiply
    723.48x = 998.08 × 487.58
  4. Step 4: Simplify right side
    723.48x = 486,641.77
  5. Step 5: Solve for x
    x = 486,641.77/723.48
  6. Step 6: Final answer
    x = 672.64

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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.