Home / 378,987.30-522,999.18-209,217.78

Finding the Fourth Proportional to 378,987.30, 522,999.18 and 209,217.78

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Solution

The fourth proportional to 378,987.30, 522,999.18 and 209,217.78 is: 288,718.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,987.30 : 522,999.18 = 209,217.78 : x
  2. Step 2: Convert to fraction form
    378,987.30/522,999.18 = 209,217.78/x
  3. Step 3: Cross multiply
    378,987.30x = 522,999.18 × 209,217.78
  4. Step 4: Simplify right side
    378,987.30x = 109,420,727,381.42
  5. Step 5: Solve for x
    x = 109,420,727,381.42/378,987.30
  6. Step 6: Final answer
    x = 288,718.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.