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Finding the Fourth Proportional to 140,555.60, 210,869.40 and 81,285.20

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Solution

The fourth proportional to 140,555.60, 210,869.40 and 81,285.20 is: 121,948.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,555.60 : 210,869.40 = 81,285.20 : x
  2. Step 2: Convert to fraction form
    140,555.60/210,869.40 = 81,285.20/x
  3. Step 3: Cross multiply
    140,555.60x = 210,869.40 × 81,285.20
  4. Step 4: Simplify right side
    140,555.60x = 17,140,561,352.88
  5. Step 5: Solve for x
    x = 17,140,561,352.88/140,555.60
  6. Step 6: Final answer
    x = 121,948.62

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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.