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Finding the Fourth Proportional to 91,806.40, 137,709.60 and 87,432.40

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Solution

The fourth proportional to 91,806.40, 137,709.60 and 87,432.40 is: 131,148.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,806.40 : 137,709.60 = 87,432.40 : x
  2. Step 2: Convert to fraction form
    91,806.40/137,709.60 = 87,432.40/x
  3. Step 3: Cross multiply
    91,806.40x = 137,709.60 × 87,432.40
  4. Step 4: Simplify right side
    91,806.40x = 12,040,280,831.04
  5. Step 5: Solve for x
    x = 12,040,280,831.04/91,806.40
  6. Step 6: Final answer
    x = 131,148.60

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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.