Home / 642,543.12-886,732.38-387,844.56

Finding the Fourth Proportional to 642,543.12, 886,732.38 and 387,844.56

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Solution

The fourth proportional to 642,543.12, 886,732.38 and 387,844.56 is: 535,239.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,543.12 : 886,732.38 = 387,844.56 : x
  2. Step 2: Convert to fraction form
    642,543.12/886,732.38 = 387,844.56/x
  3. Step 3: Cross multiply
    642,543.12x = 886,732.38 × 387,844.56
  4. Step 4: Simplify right side
    642,543.12x = 343,914,329,758.85
  5. Step 5: Solve for x
    x = 343,914,329,758.85/642,543.12
  6. Step 6: Final answer
    x = 535,239.30

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1.5x scale

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.