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Finding the Fourth Proportional to 99.20, 148.06 and 90.08

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Solution

The fourth proportional to 99.20, 148.06 and 90.08 is: 134.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 148.06 = 90.08 : x
  2. Step 2: Convert to fraction form
    99.20/148.06 = 90.08/x
  3. Step 3: Cross multiply
    99.20x = 148.06 × 90.08
  4. Step 4: Simplify right side
    99.20x = 13,337.24
  5. Step 5: Solve for x
    x = 13,337.24/99.20
  6. Step 6: Final answer
    x = 134.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.