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Finding the Fourth Proportional to 218,648.80, 328,030.80 and 78,392.80

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Solution

The fourth proportional to 218,648.80, 328,030.80 and 78,392.80 is: 117,609.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,648.80 : 328,030.80 = 78,392.80 : x
  2. Step 2: Convert to fraction form
    218,648.80/328,030.80 = 78,392.80/x
  3. Step 3: Cross multiply
    218,648.80x = 328,030.80 × 78,392.80
  4. Step 4: Simplify right side
    218,648.80x = 25,715,252,898.24
  5. Step 5: Solve for x
    x = 25,715,252,898.24/218,648.80
  6. Step 6: Final answer
    x = 117,609.85

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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.