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Finding the Fourth Proportional to 218,718.60, 328,077.90 and 139,921.80

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Solution

The fourth proportional to 218,718.60, 328,077.90 and 139,921.80 is: 209,882.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,718.60 : 328,077.90 = 139,921.80 : x
  2. Step 2: Convert to fraction form
    218,718.60/328,077.90 = 139,921.80/x
  3. Step 3: Cross multiply
    218,718.60x = 328,077.90 × 139,921.80
  4. Step 4: Simplify right side
    218,718.60x = 45,905,250,308.22
  5. Step 5: Solve for x
    x = 45,905,250,308.22/218,718.60
  6. Step 6: Final answer
    x = 209,882.70

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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.