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Finding the Fourth Proportional to 92.58, 139.56 and 91.18

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Solution

The fourth proportional to 92.58, 139.56 and 91.18 is: 137.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.58 : 139.56 = 91.18 : x
  2. Step 2: Convert to fraction form
    92.58/139.56 = 91.18/x
  3. Step 3: Cross multiply
    92.58x = 139.56 × 91.18
  4. Step 4: Simplify right side
    92.58x = 12,725.08
  5. Step 5: Solve for x
    x = 12,725.08/92.58
  6. Step 6: Final answer
    x = 137.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.