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Finding the Fourth Proportional to 421.60, 631.84 and 177.84

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Solution

The fourth proportional to 421.60, 631.84 and 177.84 is: 266.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.60 : 631.84 = 177.84 : x
  2. Step 2: Convert to fraction form
    421.60/631.84 = 177.84/x
  3. Step 3: Cross multiply
    421.60x = 631.84 × 177.84
  4. Step 4: Simplify right side
    421.60x = 112,366.43
  5. Step 5: Solve for x
    x = 112,366.43/421.60
  6. Step 6: Final answer
    x = 266.52

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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.