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Finding the Fourth Proportional to 91,497.60, 137,246.40 and 87,220.80

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Solution

The fourth proportional to 91,497.60, 137,246.40 and 87,220.80 is: 130,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,497.60 : 137,246.40 = 87,220.80 : x
  2. Step 2: Convert to fraction form
    91,497.60/137,246.40 = 87,220.80/x
  3. Step 3: Cross multiply
    91,497.60x = 137,246.40 × 87,220.80
  4. Step 4: Simplify right side
    91,497.60x = 11,970,740,805.12
  5. Step 5: Solve for x
    x = 11,970,740,805.12/91,497.60
  6. Step 6: Final answer
    x = 130,831.20

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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.