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Finding the Fourth Proportional to 74,689.60, 112,034.40 and 74,171.20

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Solution

The fourth proportional to 74,689.60, 112,034.40 and 74,171.20 is: 111,256.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,689.60 : 112,034.40 = 74,171.20 : x
  2. Step 2: Convert to fraction form
    74,689.60/112,034.40 = 74,171.20/x
  3. Step 3: Cross multiply
    74,689.60x = 112,034.40 × 74,171.20
  4. Step 4: Simplify right side
    74,689.60x = 8,309,725,889.28
  5. Step 5: Solve for x
    x = 8,309,725,889.28/74,689.60
  6. Step 6: Final answer
    x = 111,256.80

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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.