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Finding the Fourth Proportional to 162.57, 243.40 and 126.57

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Solution

The fourth proportional to 162.57, 243.40 and 126.57 is: 189.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.57 : 243.40 = 126.57 : x
  2. Step 2: Convert to fraction form
    162.57/243.40 = 126.57/x
  3. Step 3: Cross multiply
    162.57x = 243.40 × 126.57
  4. Step 4: Simplify right side
    162.57x = 30,806.53
  5. Step 5: Solve for x
    x = 30,806.53/162.57
  6. Step 6: Final answer
    x = 189.50

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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.