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Finding the Fourth Proportional to 372.48, 558.78 and 128.95

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Solution

The fourth proportional to 372.48, 558.78 and 128.95 is: 193.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.48 : 558.78 = 128.95 : x
  2. Step 2: Convert to fraction form
    372.48/558.78 = 128.95/x
  3. Step 3: Cross multiply
    372.48x = 558.78 × 128.95
  4. Step 4: Simplify right side
    372.48x = 72,054.68
  5. Step 5: Solve for x
    x = 72,054.68/372.48
  6. Step 6: Final answer
    x = 193.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.