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Finding the Fourth Proportional to 74,356.80, 111,340.80 and 47,918.40

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Solution

The fourth proportional to 74,356.80, 111,340.80 and 47,918.40 is: 71,752.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,356.80 : 111,340.80 = 47,918.40 : x
  2. Step 2: Convert to fraction form
    74,356.80/111,340.80 = 47,918.40/x
  3. Step 3: Cross multiply
    74,356.80x = 111,340.80 × 47,918.40
  4. Step 4: Simplify right side
    74,356.80x = 5,335,272,990.72
  5. Step 5: Solve for x
    x = 5,335,272,990.72/74,356.80
  6. Step 6: Final answer
    x = 71,752.32

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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.