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Finding the Fourth Proportional to 86,645.74, 129,672.91 and 72,621.60

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Solution

The fourth proportional to 86,645.74, 129,672.91 and 72,621.60 is: 108,684.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,645.74 : 129,672.91 = 72,621.60 : x
  2. Step 2: Convert to fraction form
    86,645.74/129,672.91 = 72,621.60/x
  3. Step 3: Cross multiply
    86,645.74x = 129,672.91 × 72,621.60
  4. Step 4: Simplify right side
    86,645.74x = 9,417,054,200.86
  5. Step 5: Solve for x
    x = 9,417,054,200.86/86,645.74
  6. Step 6: Final answer
    x = 108,684.56

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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.