Home / 218,986.38-328,479.57-85,929.30

Finding the Fourth Proportional to 218,986.38, 328,479.57 and 85,929.30

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Solution

The fourth proportional to 218,986.38, 328,479.57 and 85,929.30 is: 128,893.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,986.38 : 328,479.57 = 85,929.30 : x
  2. Step 2: Convert to fraction form
    218,986.38/328,479.57 = 85,929.30/x
  3. Step 3: Cross multiply
    218,986.38x = 328,479.57 × 85,929.30
  4. Step 4: Simplify right side
    218,986.38x = 28,226,019,514.40
  5. Step 5: Solve for x
    x = 28,226,019,514.40/218,986.38
  6. Step 6: Final answer
    x = 128,893.95

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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.