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Finding the Fourth Proportional to 77,066.78, 115,607.86 and 20,907.80

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Solution

The fourth proportional to 77,066.78, 115,607.86 and 20,907.80 is: 31,363.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,066.78 : 115,607.86 = 20,907.80 : x
  2. Step 2: Convert to fraction form
    77,066.78/115,607.86 = 20,907.80/x
  3. Step 3: Cross multiply
    77,066.78x = 115,607.86 × 20,907.80
  4. Step 4: Simplify right side
    77,066.78x = 2,417,106,015.31
  5. Step 5: Solve for x
    x = 2,417,106,015.31/77,066.78
  6. Step 6: Final answer
    x = 31,363.79

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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.