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Finding the Fourth Proportional to 148.95, 223.02 and 128.70

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Solution

The fourth proportional to 148.95, 223.02 and 128.70 is: 192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.95 : 223.02 = 128.70 : x
  2. Step 2: Convert to fraction form
    148.95/223.02 = 128.70/x
  3. Step 3: Cross multiply
    148.95x = 223.02 × 128.70
  4. Step 4: Simplify right side
    148.95x = 28,702.67
  5. Step 5: Solve for x
    x = 28,702.67/148.95
  6. Step 6: Final answer
    x = 192.70

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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.