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Finding the Fourth Proportional to 86,589.30, 129,819.15 and 47,190.90

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Solution

The fourth proportional to 86,589.30, 129,819.15 and 47,190.90 is: 70,751.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,589.30 : 129,819.15 = 47,190.90 : x
  2. Step 2: Convert to fraction form
    86,589.30/129,819.15 = 47,190.90/x
  3. Step 3: Cross multiply
    86,589.30x = 129,819.15 × 47,190.90
  4. Step 4: Simplify right side
    86,589.30x = 6,126,282,525.74
  5. Step 5: Solve for x
    x = 6,126,282,525.74/86,589.30
  6. Step 6: Final answer
    x = 70,751.03

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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.