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Finding the Fourth Proportional to 74,908.80, 112,363.20 and 68,493.60

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Solution

The fourth proportional to 74,908.80, 112,363.20 and 68,493.60 is: 102,740.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,908.80 : 112,363.20 = 68,493.60 : x
  2. Step 2: Convert to fraction form
    74,908.80/112,363.20 = 68,493.60/x
  3. Step 3: Cross multiply
    74,908.80x = 112,363.20 × 68,493.60
  4. Step 4: Simplify right side
    74,908.80x = 7,696,160,075.52
  5. Step 5: Solve for x
    x = 7,696,160,075.52/74,908.80
  6. Step 6: Final answer
    x = 102,740.40

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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.