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Finding the Fourth Proportional to 86,638.80, 129,958.20 and 53,250.60

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Solution

The fourth proportional to 86,638.80, 129,958.20 and 53,250.60 is: 79,875.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,638.80 : 129,958.20 = 53,250.60 : x
  2. Step 2: Convert to fraction form
    86,638.80/129,958.20 = 53,250.60/x
  3. Step 3: Cross multiply
    86,638.80x = 129,958.20 × 53,250.60
  4. Step 4: Simplify right side
    86,638.80x = 6,920,352,124.92
  5. Step 5: Solve for x
    x = 6,920,352,124.92/86,638.80
  6. Step 6: Final answer
    x = 79,875.90

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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.