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Finding the Fourth Proportional to 723.96, 999.20 and 429.20

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Solution

The fourth proportional to 723.96, 999.20 and 429.20 is: 592.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.96 : 999.20 = 429.20 : x
  2. Step 2: Convert to fraction form
    723.96/999.20 = 429.20/x
  3. Step 3: Cross multiply
    723.96x = 999.20 × 429.20
  4. Step 4: Simplify right side
    723.96x = 428,856.64
  5. Step 5: Solve for x
    x = 428,856.64/723.96
  6. Step 6: Final answer
    x = 592.38

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Half scale
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Double scale
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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.