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Finding the Fourth Proportional to 398.76, 550.42 and 243.52

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Solution

The fourth proportional to 398.76, 550.42 and 243.52 is: 336.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.76 : 550.42 = 243.52 : x
  2. Step 2: Convert to fraction form
    398.76/550.42 = 243.52/x
  3. Step 3: Cross multiply
    398.76x = 550.42 × 243.52
  4. Step 4: Simplify right side
    398.76x = 134,038.28
  5. Step 5: Solve for x
    x = 134,038.28/398.76
  6. Step 6: Final answer
    x = 336.14

Related Problems

Find fourth proportional to 199.38, 275.21 and 121.76
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Double scale
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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.