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Finding the Fourth Proportional to 545.52, 752.40 and 398.38

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Solution

The fourth proportional to 545.52, 752.40 and 398.38 is: 549.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.52 : 752.40 = 398.38 : x
  2. Step 2: Convert to fraction form
    545.52/752.40 = 398.38/x
  3. Step 3: Cross multiply
    545.52x = 752.40 × 398.38
  4. Step 4: Simplify right side
    545.52x = 299,741.11
  5. Step 5: Solve for x
    x = 299,741.11/545.52
  6. Step 6: Final answer
    x = 549.46

Related Problems

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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.