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Finding the Fourth Proportional to 545.91, 753.72 and 398.29

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Solution

The fourth proportional to 545.91, 753.72 and 398.29 is: 549.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.91 : 753.72 = 398.29 : x
  2. Step 2: Convert to fraction form
    545.91/753.72 = 398.29/x
  3. Step 3: Cross multiply
    545.91x = 753.72 × 398.29
  4. Step 4: Simplify right side
    545.91x = 300,193.38
  5. Step 5: Solve for x
    x = 300,193.38/545.91
  6. Step 6: Final answer
    x = 549.90

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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.