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Finding the Fourth Proportional to 723.76, 1,085.72 and 398.96

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Solution

The fourth proportional to 723.76, 1,085.72 and 398.96 is: 598.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.76 : 1,085.72 = 398.96 : x
  2. Step 2: Convert to fraction form
    723.76/1,085.72 = 398.96/x
  3. Step 3: Cross multiply
    723.76x = 1,085.72 × 398.96
  4. Step 4: Simplify right side
    723.76x = 433,158.85
  5. Step 5: Solve for x
    x = 433,158.85/723.76
  6. Step 6: Final answer
    x = 598.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.