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Finding the Fourth Proportional to 169,689.60, 254,534.40 and 85,708.80

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Solution

The fourth proportional to 169,689.60, 254,534.40 and 85,708.80 is: 128,563.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,689.60 : 254,534.40 = 85,708.80 : x
  2. Step 2: Convert to fraction form
    169,689.60/254,534.40 = 85,708.80/x
  3. Step 3: Cross multiply
    169,689.60x = 254,534.40 × 85,708.80
  4. Step 4: Simplify right side
    169,689.60x = 21,815,837,982.72
  5. Step 5: Solve for x
    x = 21,815,837,982.72/169,689.60
  6. Step 6: Final answer
    x = 128,563.20

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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.