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Finding the Fourth Proportional to 91,359.60, 137,039.40 and 87,860.40

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Solution

The fourth proportional to 91,359.60, 137,039.40 and 87,860.40 is: 131,790.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,359.60 : 137,039.40 = 87,860.40 : x
  2. Step 2: Convert to fraction form
    91,359.60/137,039.40 = 87,860.40/x
  3. Step 3: Cross multiply
    91,359.60x = 137,039.40 × 87,860.40
  4. Step 4: Simplify right side
    91,359.60x = 12,040,336,499.76
  5. Step 5: Solve for x
    x = 12,040,336,499.76/91,359.60
  6. Step 6: Final answer
    x = 131,790.60

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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.