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Finding the Fourth Proportional to 86,574.46, 129,861.76 and 69,155

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Solution

The fourth proportional to 86,574.46, 129,861.76 and 69,155 is: 103,732.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,574.46 : 129,861.76 = 69,155 : x
  2. Step 2: Convert to fraction form
    86,574.46/129,861.76 = 69,155/x
  3. Step 3: Cross multiply
    86,574.46x = 129,861.76 × 69,155
  4. Step 4: Simplify right side
    86,574.46x = 8,980,590,012.80
  5. Step 5: Solve for x
    x = 8,980,590,012.80/86,574.46
  6. Step 6: Final answer
    x = 103,732.56

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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.