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Finding the Fourth Proportional to 74,657,838.60, 111,986,757.90 and 20,805,150.60

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Solution

The fourth proportional to 74,657,838.60, 111,986,757.90 and 20,805,150.60 is: 31,207,725.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,657,838.60 : 111,986,757.90 = 20,805,150.60 : x
  2. Step 2: Convert to fraction form
    74,657,838.60/111,986,757.90 = 20,805,150.60/x
  3. Step 3: Cross multiply
    74,657,838.60x = 111,986,757.90 × 20,805,150.60
  4. Step 4: Simplify right side
    74,657,838.60x = 2,329,901,363,315,240
  5. Step 5: Solve for x
    x = 2,329,901,363,315,240/74,657,838.60
  6. Step 6: Final answer
    x = 31,207,725.90

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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.