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Finding the Fourth Proportional to 98.77, 136.28 and 65.61

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Solution

The fourth proportional to 98.77, 136.28 and 65.61 is: 90.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.77 : 136.28 = 65.61 : x
  2. Step 2: Convert to fraction form
    98.77/136.28 = 65.61/x
  3. Step 3: Cross multiply
    98.77x = 136.28 × 65.61
  4. Step 4: Simplify right side
    98.77x = 8,941.49
  5. Step 5: Solve for x
    x = 8,941.49/98.77
  6. Step 6: Final answer
    x = 90.53

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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.