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Finding the Fourth Proportional to 91,386.60, 136,811.10 and 68,116.20

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Solution

The fourth proportional to 91,386.60, 136,811.10 and 68,116.20 is: 101,973.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,386.60 : 136,811.10 = 68,116.20 : x
  2. Step 2: Convert to fraction form
    91,386.60/136,811.10 = 68,116.20/x
  3. Step 3: Cross multiply
    91,386.60x = 136,811.10 × 68,116.20
  4. Step 4: Simplify right side
    91,386.60x = 9,319,052,249.82
  5. Step 5: Solve for x
    x = 9,319,052,249.82/91,386.60
  6. Step 6: Final answer
    x = 101,973.95

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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.