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Finding the Fourth Proportional to 140,559.60, 210,875.40 and 81,289.20

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Solution

The fourth proportional to 140,559.60, 210,875.40 and 81,289.20 is: 121,954.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,559.60 : 210,875.40 = 81,289.20 : x
  2. Step 2: Convert to fraction form
    140,559.60/210,875.40 = 81,289.20/x
  3. Step 3: Cross multiply
    140,559.60x = 210,875.40 × 81,289.20
  4. Step 4: Simplify right side
    140,559.60x = 17,141,892,565.68
  5. Step 5: Solve for x
    x = 17,141,892,565.68/140,559.60
  6. Step 6: Final answer
    x = 121,954.62

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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.