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Finding the Fourth Proportional to 118.10, 162.93 and 90.43

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Solution

The fourth proportional to 118.10, 162.93 and 90.43 is: 124.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.10 : 162.93 = 90.43 : x
  2. Step 2: Convert to fraction form
    118.10/162.93 = 90.43/x
  3. Step 3: Cross multiply
    118.10x = 162.93 × 90.43
  4. Step 4: Simplify right side
    118.10x = 14,733.76
  5. Step 5: Solve for x
    x = 14,733.76/118.10
  6. Step 6: Final answer
    x = 124.76

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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.