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Finding the Fourth Proportional to 77,287.80, 115,931.70 and 68,977.20

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Solution

The fourth proportional to 77,287.80, 115,931.70 and 68,977.20 is: 103,465.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,287.80 : 115,931.70 = 68,977.20 : x
  2. Step 2: Convert to fraction form
    77,287.80/115,931.70 = 68,977.20/x
  3. Step 3: Cross multiply
    77,287.80x = 115,931.70 × 68,977.20
  4. Step 4: Simplify right side
    77,287.80x = 7,996,644,057.24
  5. Step 5: Solve for x
    x = 7,996,644,057.24/77,287.80
  6. Step 6: Final answer
    x = 103,465.80

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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.