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Finding the Fourth Proportional to 99.40, 148.90 and 47.89

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Solution

The fourth proportional to 99.40, 148.90 and 47.89 is: 71.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.40 : 148.90 = 47.89 : x
  2. Step 2: Convert to fraction form
    99.40/148.90 = 47.89/x
  3. Step 3: Cross multiply
    99.40x = 148.90 × 47.89
  4. Step 4: Simplify right side
    99.40x = 7,131.04
  5. Step 5: Solve for x
    x = 7,131.04/99.40
  6. Step 6: Final answer
    x = 71.74

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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.