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Finding the Fourth Proportional to 86,570.70, 129,856.05 and 71,796.30

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Solution

The fourth proportional to 86,570.70, 129,856.05 and 71,796.30 is: 107,694.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,570.70 : 129,856.05 = 71,796.30 : x
  2. Step 2: Convert to fraction form
    86,570.70/129,856.05 = 71,796.30/x
  3. Step 3: Cross multiply
    86,570.70x = 129,856.05 × 71,796.30
  4. Step 4: Simplify right side
    86,570.70x = 9,323,183,922.62
  5. Step 5: Solve for x
    x = 9,323,183,922.62/86,570.70
  6. Step 6: Final answer
    x = 107,694.45

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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.