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Finding the Fourth Proportional to 99.02, 148.26 and 78.62

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Solution

The fourth proportional to 99.02, 148.26 and 78.62 is: 117.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.02 : 148.26 = 78.62 : x
  2. Step 2: Convert to fraction form
    99.02/148.26 = 78.62/x
  3. Step 3: Cross multiply
    99.02x = 148.26 × 78.62
  4. Step 4: Simplify right side
    99.02x = 11,656.20
  5. Step 5: Solve for x
    x = 11,656.20/99.02
  6. Step 6: Final answer
    x = 117.72

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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.