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Finding the Fourth Proportional to 218,985.20, 328,234.80 and 85,821.20

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Solution

The fourth proportional to 218,985.20, 328,234.80 and 85,821.20 is: 128,636.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,985.20 : 328,234.80 = 85,821.20 : x
  2. Step 2: Convert to fraction form
    218,985.20/328,234.80 = 85,821.20/x
  3. Step 3: Cross multiply
    218,985.20x = 328,234.80 × 85,821.20
  4. Step 4: Simplify right side
    218,985.20x = 28,169,504,417.76
  5. Step 5: Solve for x
    x = 28,169,504,417.76/218,985.20
  6. Step 6: Final answer
    x = 128,636.57

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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.