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Finding the Fourth Proportional to 91.83, 137.40 and 64.80

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Solution

The fourth proportional to 91.83, 137.40 and 64.80 is: 96.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.83 : 137.40 = 64.80 : x
  2. Step 2: Convert to fraction form
    91.83/137.40 = 64.80/x
  3. Step 3: Cross multiply
    91.83x = 137.40 × 64.80
  4. Step 4: Simplify right side
    91.83x = 8,903.28
  5. Step 5: Solve for x
    x = 8,903.28/91.83
  6. Step 6: Final answer
    x = 96.95

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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.