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Finding the Fourth Proportional to 393.32, 542.50 and 275.28

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Solution

The fourth proportional to 393.32, 542.50 and 275.28 is: 379.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.32 : 542.50 = 275.28 : x
  2. Step 2: Convert to fraction form
    393.32/542.50 = 275.28/x
  3. Step 3: Cross multiply
    393.32x = 542.50 × 275.28
  4. Step 4: Simplify right side
    393.32x = 149,339.40
  5. Step 5: Solve for x
    x = 149,339.40/393.32
  6. Step 6: Final answer
    x = 379.69

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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.