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Finding the Fourth Proportional to 552.92, 762.34 and 421.72

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Solution

The fourth proportional to 552.92, 762.34 and 421.72 is: 581.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.92 : 762.34 = 421.72 : x
  2. Step 2: Convert to fraction form
    552.92/762.34 = 421.72/x
  3. Step 3: Cross multiply
    552.92x = 762.34 × 421.72
  4. Step 4: Simplify right side
    552.92x = 321,494.02
  5. Step 5: Solve for x
    x = 321,494.02/552.92
  6. Step 6: Final answer
    x = 581.45

Related Problems

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Double scale
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Similar ratio
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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.