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Finding the Fourth Proportional to 77,310.86, 115,980.12 and 39,860.87

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Solution

The fourth proportional to 77,310.86, 115,980.12 and 39,860.87 is: 59,798.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,310.86 : 115,980.12 = 39,860.87 : x
  2. Step 2: Convert to fraction form
    77,310.86/115,980.12 = 39,860.87/x
  3. Step 3: Cross multiply
    77,310.86x = 115,980.12 × 39,860.87
  4. Step 4: Simplify right side
    77,310.86x = 4,623,067,906.00
  5. Step 5: Solve for x
    x = 4,623,067,906.00/77,310.86
  6. Step 6: Final answer
    x = 59,798.43

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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.