Home / 1,387,489.20-2,079,851.40-638,228.40

Finding the Fourth Proportional to 1,387,489.20, 2,079,851.40 and 638,228.40

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Solution

The fourth proportional to 1,387,489.20, 2,079,851.40 and 638,228.40 is: 956,706.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,489.20 : 2,079,851.40 = 638,228.40 : x
  2. Step 2: Convert to fraction form
    1,387,489.20/2,079,851.40 = 638,228.40/x
  3. Step 3: Cross multiply
    1,387,489.20x = 2,079,851.40 × 638,228.40
  4. Step 4: Simplify right side
    1,387,489.20x = 1,327,420,231,259.76
  5. Step 5: Solve for x
    x = 1,327,420,231,259.76/1,387,489.20
  6. Step 6: Final answer
    x = 956,706.71

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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.