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Finding the Fourth Proportional to 91,987.20, 137,980.80 and 77,115.60

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Solution

The fourth proportional to 91,987.20, 137,980.80 and 77,115.60 is: 115,673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,987.20 : 137,980.80 = 77,115.60 : x
  2. Step 2: Convert to fraction form
    91,987.20/137,980.80 = 77,115.60/x
  3. Step 3: Cross multiply
    91,987.20x = 137,980.80 × 77,115.60
  4. Step 4: Simplify right side
    91,987.20x = 10,640,472,180.48
  5. Step 5: Solve for x
    x = 10,640,472,180.48/91,987.20
  6. Step 6: Final answer
    x = 115,673.40

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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.