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Finding the Fourth Proportional to 218,826.40, 328,239.60 and 215,327.20

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Solution

The fourth proportional to 218,826.40, 328,239.60 and 215,327.20 is: 322,990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,826.40 : 328,239.60 = 215,327.20 : x
  2. Step 2: Convert to fraction form
    218,826.40/328,239.60 = 215,327.20/x
  3. Step 3: Cross multiply
    218,826.40x = 328,239.60 × 215,327.20
  4. Step 4: Simplify right side
    218,826.40x = 70,678,913,997.12
  5. Step 5: Solve for x
    x = 70,678,913,997.12/218,826.40
  6. Step 6: Final answer
    x = 322,990.80

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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.