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Finding the Fourth Proportional to 91,324.60, 136,986.90 and 76,890.40

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Solution

The fourth proportional to 91,324.60, 136,986.90 and 76,890.40 is: 115,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,324.60 : 136,986.90 = 76,890.40 : x
  2. Step 2: Convert to fraction form
    91,324.60/136,986.90 = 76,890.40/x
  3. Step 3: Cross multiply
    91,324.60x = 136,986.90 × 76,890.40
  4. Step 4: Simplify right side
    91,324.60x = 10,532,977,535.76
  5. Step 5: Solve for x
    x = 10,532,977,535.76/91,324.60
  6. Step 6: Final answer
    x = 115,335.60

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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.