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Finding the Fourth Proportional to 91,025.80, 136,538.70 and 83,422.60

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Solution

The fourth proportional to 91,025.80, 136,538.70 and 83,422.60 is: 125,133.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,025.80 : 136,538.70 = 83,422.60 : x
  2. Step 2: Convert to fraction form
    91,025.80/136,538.70 = 83,422.60/x
  3. Step 3: Cross multiply
    91,025.80x = 136,538.70 × 83,422.60
  4. Step 4: Simplify right side
    91,025.80x = 11,390,413,354.62
  5. Step 5: Solve for x
    x = 11,390,413,354.62/91,025.80
  6. Step 6: Final answer
    x = 125,133.90

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1.5x scale

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.