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Finding the Fourth Proportional to 77,326.60, 115,989.90 and 40,385.80

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Solution

The fourth proportional to 77,326.60, 115,989.90 and 40,385.80 is: 60,578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,326.60 : 115,989.90 = 40,385.80 : x
  2. Step 2: Convert to fraction form
    77,326.60/115,989.90 = 40,385.80/x
  3. Step 3: Cross multiply
    77,326.60x = 115,989.90 × 40,385.80
  4. Step 4: Simplify right side
    77,326.60x = 4,684,344,903.42
  5. Step 5: Solve for x
    x = 4,684,344,903.42/77,326.60
  6. Step 6: Final answer
    x = 60,578.70

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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.