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Finding the Fourth Proportional to 99.18, 148.91 and 90.63

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Solution

The fourth proportional to 99.18, 148.91 and 90.63 is: 136.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.18 : 148.91 = 90.63 : x
  2. Step 2: Convert to fraction form
    99.18/148.91 = 90.63/x
  3. Step 3: Cross multiply
    99.18x = 148.91 × 90.63
  4. Step 4: Simplify right side
    99.18x = 13,495.26
  5. Step 5: Solve for x
    x = 13,495.26/99.18
  6. Step 6: Final answer
    x = 136.07

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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.