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Finding the Fourth Proportional to 140,210.70, 210,316.05 and 81,161.70

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Solution

The fourth proportional to 140,210.70, 210,316.05 and 81,161.70 is: 121,742.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,210.70 : 210,316.05 = 81,161.70 : x
  2. Step 2: Convert to fraction form
    140,210.70/210,316.05 = 81,161.70/x
  3. Step 3: Cross multiply
    140,210.70x = 210,316.05 × 81,161.70
  4. Step 4: Simplify right side
    140,210.70x = 17,069,608,155.29
  5. Step 5: Solve for x
    x = 17,069,608,155.29/140,210.70
  6. Step 6: Final answer
    x = 121,742.55

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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.