Home / 218,778.20-328,240.10-78,547.80

Finding the Fourth Proportional to 218,778.20, 328,240.10 and 78,547.80

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Solution

The fourth proportional to 218,778.20, 328,240.10 and 78,547.80 is: 117,847.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,778.20 : 328,240.10 = 78,547.80 : x
  2. Step 2: Convert to fraction form
    218,778.20/328,240.10 = 78,547.80/x
  3. Step 3: Cross multiply
    218,778.20x = 328,240.10 × 78,547.80
  4. Step 4: Simplify right side
    218,778.20x = 25,782,537,726.78
  5. Step 5: Solve for x
    x = 25,782,537,726.78/218,778.20
  6. Step 6: Final answer
    x = 117,847.84

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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.