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Finding the Fourth Proportional to 99.32, 148.74 and 85.72

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Solution

The fourth proportional to 99.32, 148.74 and 85.72 is: 128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.32 : 148.74 = 85.72 : x
  2. Step 2: Convert to fraction form
    99.32/148.74 = 85.72/x
  3. Step 3: Cross multiply
    99.32x = 148.74 × 85.72
  4. Step 4: Simplify right side
    99.32x = 12,749.99
  5. Step 5: Solve for x
    x = 12,749.99/99.32
  6. Step 6: Final answer
    x = 128.37

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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.