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Finding the Fourth Proportional to 56,984.60, 78,655.40 and 33,120.78

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Solution

The fourth proportional to 56,984.60, 78,655.40 and 33,120.78 is: 45,716.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,984.60 : 78,655.40 = 33,120.78 : x
  2. Step 2: Convert to fraction form
    56,984.60/78,655.40 = 33,120.78/x
  3. Step 3: Cross multiply
    56,984.60x = 78,655.40 × 33,120.78
  4. Step 4: Simplify right side
    56,984.60x = 2,605,128,033.61
  5. Step 5: Solve for x
    x = 2,605,128,033.61/56,984.60
  6. Step 6: Final answer
    x = 45,716.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.