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Finding the Fourth Proportional to 78,406.80, 117,415.80 and 62,854.80

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Solution

The fourth proportional to 78,406.80, 117,415.80 and 62,854.80 is: 94,126.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,406.80 : 117,415.80 = 62,854.80 : x
  2. Step 2: Convert to fraction form
    78,406.80/117,415.80 = 62,854.80/x
  3. Step 3: Cross multiply
    78,406.80x = 117,415.80 × 62,854.80
  4. Step 4: Simplify right side
    78,406.80x = 7,380,146,625.84
  5. Step 5: Solve for x
    x = 7,380,146,625.84/78,406.80
  6. Step 6: Final answer
    x = 94,126.36

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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.