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Finding the Fourth Proportional to 77,280.60, 115,596.90 and 69,439.80

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Solution

The fourth proportional to 77,280.60, 115,596.90 and 69,439.80 is: 103,868.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,280.60 : 115,596.90 = 69,439.80 : x
  2. Step 2: Convert to fraction form
    77,280.60/115,596.90 = 69,439.80/x
  3. Step 3: Cross multiply
    77,280.60x = 115,596.90 × 69,439.80
  4. Step 4: Simplify right side
    77,280.60x = 8,027,025,616.62
  5. Step 5: Solve for x
    x = 8,027,025,616.62/77,280.60
  6. Step 6: Final answer
    x = 103,868.57

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1.5x scale

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.