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Finding the Fourth Proportional to 100.80, 152.10 and 95.40

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Solution

The fourth proportional to 100.80, 152.10 and 95.40 is: 143.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.80 : 152.10 = 95.40 : x
  2. Step 2: Convert to fraction form
    100.80/152.10 = 95.40/x
  3. Step 3: Cross multiply
    100.80x = 152.10 × 95.40
  4. Step 4: Simplify right side
    100.80x = 14,510.34
  5. Step 5: Solve for x
    x = 14,510.34/100.80
  6. Step 6: Final answer
    x = 143.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.