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Finding the Fourth Proportional to 98.15, 135.40 and 65.42

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Solution

The fourth proportional to 98.15, 135.40 and 65.42 is: 90.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.15 : 135.40 = 65.42 : x
  2. Step 2: Convert to fraction form
    98.15/135.40 = 65.42/x
  3. Step 3: Cross multiply
    98.15x = 135.40 × 65.42
  4. Step 4: Simplify right side
    98.15x = 8,857.54
  5. Step 5: Solve for x
    x = 8,857.54/98.15
  6. Step 6: Final answer
    x = 90.24

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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.