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Finding the Fourth Proportional to 162.59, 243.98 and 85.57

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Solution

The fourth proportional to 162.59, 243.98 and 85.57 is: 128.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.59 : 243.98 = 85.57 : x
  2. Step 2: Convert to fraction form
    162.59/243.98 = 85.57/x
  3. Step 3: Cross multiply
    162.59x = 243.98 × 85.57
  4. Step 4: Simplify right side
    162.59x = 20,875.72
  5. Step 5: Solve for x
    x = 20,875.72/162.59
  6. Step 6: Final answer
    x = 128.39

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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.