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Finding the Fourth Proportional to 99.30, 149.70 and 93.90

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Solution

The fourth proportional to 99.30, 149.70 and 93.90 is: 141.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.30 : 149.70 = 93.90 : x
  2. Step 2: Convert to fraction form
    99.30/149.70 = 93.90/x
  3. Step 3: Cross multiply
    99.30x = 149.70 × 93.90
  4. Step 4: Simplify right side
    99.30x = 14,056.83
  5. Step 5: Solve for x
    x = 14,056.83/99.30
  6. Step 6: Final answer
    x = 141.56

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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.