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Finding the Fourth Proportional to 91,770.76, 126,509.61 and 64,865.80

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Solution

The fourth proportional to 91,770.76, 126,509.61 and 64,865.80 is: 89,420.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,770.76 : 126,509.61 = 64,865.80 : x
  2. Step 2: Convert to fraction form
    91,770.76/126,509.61 = 64,865.80/x
  3. Step 3: Cross multiply
    91,770.76x = 126,509.61 × 64,865.80
  4. Step 4: Simplify right side
    91,770.76x = 8,206,147,060.34
  5. Step 5: Solve for x
    x = 8,206,147,060.34/91,770.76
  6. Step 6: Final answer
    x = 89,420.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.