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Finding the Fourth Proportional to 91.40, 136.58 and 65.60

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Solution

The fourth proportional to 91.40, 136.58 and 65.60 is: 98.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.40 : 136.58 = 65.60 : x
  2. Step 2: Convert to fraction form
    91.40/136.58 = 65.60/x
  3. Step 3: Cross multiply
    91.40x = 136.58 × 65.60
  4. Step 4: Simplify right side
    91.40x = 8,959.65
  5. Step 5: Solve for x
    x = 8,959.65/91.40
  6. Step 6: Final answer
    x = 98.03

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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.