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Finding the Fourth Proportional to 177.90, 245.51 and 99.21

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Solution

The fourth proportional to 177.90, 245.51 and 99.21 is: 136.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.90 : 245.51 = 99.21 : x
  2. Step 2: Convert to fraction form
    177.90/245.51 = 99.21/x
  3. Step 3: Cross multiply
    177.90x = 245.51 × 99.21
  4. Step 4: Simplify right side
    177.90x = 24,356.55
  5. Step 5: Solve for x
    x = 24,356.55/177.90
  6. Step 6: Final answer
    x = 136.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.