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Finding the Fourth Proportional to 92.16, 137.28 and 90.06

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Solution

The fourth proportional to 92.16, 137.28 and 90.06 is: 134.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.16 : 137.28 = 90.06 : x
  2. Step 2: Convert to fraction form
    92.16/137.28 = 90.06/x
  3. Step 3: Cross multiply
    92.16x = 137.28 × 90.06
  4. Step 4: Simplify right side
    92.16x = 12,363.44
  5. Step 5: Solve for x
    x = 12,363.44/92.16
  6. Step 6: Final answer
    x = 134.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.