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Finding the Fourth Proportional to 86,574.60, 129,861.90 and 71,812.35

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Solution

The fourth proportional to 86,574.60, 129,861.90 and 71,812.35 is: 107,718.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,574.60 : 129,861.90 = 71,812.35 : x
  2. Step 2: Convert to fraction form
    86,574.60/129,861.90 = 71,812.35/x
  3. Step 3: Cross multiply
    86,574.60x = 129,861.90 × 71,812.35
  4. Step 4: Simplify right side
    86,574.60x = 9,325,688,214.47
  5. Step 5: Solve for x
    x = 9,325,688,214.47/86,574.60
  6. Step 6: Final answer
    x = 107,718.53

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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.