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Finding the Fourth Proportional to 86,542.40, 129,813.60 and 76,865.60

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Solution

The fourth proportional to 86,542.40, 129,813.60 and 76,865.60 is: 115,298.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,542.40 : 129,813.60 = 76,865.60 : x
  2. Step 2: Convert to fraction form
    86,542.40/129,813.60 = 76,865.60/x
  3. Step 3: Cross multiply
    86,542.40x = 129,813.60 × 76,865.60
  4. Step 4: Simplify right side
    86,542.40x = 9,978,200,252.16
  5. Step 5: Solve for x
    x = 9,978,200,252.16/86,542.40
  6. Step 6: Final answer
    x = 115,298.40

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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.