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Finding the Fourth Proportional to 91,756.80, 137,721.60 and 56,764.80

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Solution

The fourth proportional to 91,756.80, 137,721.60 and 56,764.80 is: 85,200.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,756.80 : 137,721.60 = 56,764.80 : x
  2. Step 2: Convert to fraction form
    91,756.80/137,721.60 = 56,764.80/x
  3. Step 3: Cross multiply
    91,756.80x = 137,721.60 × 56,764.80
  4. Step 4: Simplify right side
    91,756.80x = 7,817,739,079.68
  5. Step 5: Solve for x
    x = 7,817,739,079.68/91,756.80
  6. Step 6: Final answer
    x = 85,200.65

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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.