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Finding the Fourth Proportional to 574.76, 793.28 and 398.20

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Solution

The fourth proportional to 574.76, 793.28 and 398.20 is: 549.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.76 : 793.28 = 398.20 : x
  2. Step 2: Convert to fraction form
    574.76/793.28 = 398.20/x
  3. Step 3: Cross multiply
    574.76x = 793.28 × 398.20
  4. Step 4: Simplify right side
    574.76x = 315,884.10
  5. Step 5: Solve for x
    x = 315,884.10/574.76
  6. Step 6: Final answer
    x = 549.59

Related Problems

Find fourth proportional to 287.38, 396.64 and 199.10
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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.