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Finding the Fourth Proportional to 86,542.60, 129,813.90 and 39,886.60

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Solution

The fourth proportional to 86,542.60, 129,813.90 and 39,886.60 is: 59,829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,542.60 : 129,813.90 = 39,886.60 : x
  2. Step 2: Convert to fraction form
    86,542.60/129,813.90 = 39,886.60/x
  3. Step 3: Cross multiply
    86,542.60x = 129,813.90 × 39,886.60
  4. Step 4: Simplify right side
    86,542.60x = 5,177,835,103.74
  5. Step 5: Solve for x
    x = 5,177,835,103.74/86,542.60
  6. Step 6: Final answer
    x = 59,829.90

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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.