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Finding the Fourth Proportional to 162.96, 224.90 and 89.28

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Solution

The fourth proportional to 162.96, 224.90 and 89.28 is: 123.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.96 : 224.90 = 89.28 : x
  2. Step 2: Convert to fraction form
    162.96/224.90 = 89.28/x
  3. Step 3: Cross multiply
    162.96x = 224.90 × 89.28
  4. Step 4: Simplify right side
    162.96x = 20,079.47
  5. Step 5: Solve for x
    x = 20,079.47/162.96
  6. Step 6: Final answer
    x = 123.21

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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.