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Finding the Fourth Proportional to 90.16, 135.12 and 61.48

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Solution

The fourth proportional to 90.16, 135.12 and 61.48 is: 92.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.16 : 135.12 = 61.48 : x
  2. Step 2: Convert to fraction form
    90.16/135.12 = 61.48/x
  3. Step 3: Cross multiply
    90.16x = 135.12 × 61.48
  4. Step 4: Simplify right side
    90.16x = 8,307.18
  5. Step 5: Solve for x
    x = 8,307.18/90.16
  6. Step 6: Final answer
    x = 92.14

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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.