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Finding the Fourth Proportional to 74,979.80, 103,470.24 and 40,988.40

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Solution

The fourth proportional to 74,979.80, 103,470.24 and 40,988.40 is: 56,562.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,979.80 : 103,470.24 = 40,988.40 : x
  2. Step 2: Convert to fraction form
    74,979.80/103,470.24 = 40,988.40/x
  3. Step 3: Cross multiply
    74,979.80x = 103,470.24 × 40,988.40
  4. Step 4: Simplify right side
    74,979.80x = 4,241,079,585.22
  5. Step 5: Solve for x
    x = 4,241,079,585.22/74,979.80
  6. Step 6: Final answer
    x = 56,562.96

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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.