Home / 642,538.12-886,725.48-387,839.56

Finding the Fourth Proportional to 642,538.12, 886,725.48 and 387,839.56

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Solution

The fourth proportional to 642,538.12, 886,725.48 and 387,839.56 is: 535,232.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,538.12 : 886,725.48 = 387,839.56 : x
  2. Step 2: Convert to fraction form
    642,538.12/886,725.48 = 387,839.56/x
  3. Step 3: Cross multiply
    642,538.12x = 886,725.48 × 387,839.56
  4. Step 4: Simplify right side
    642,538.12x = 343,907,220,003.99
  5. Step 5: Solve for x
    x = 343,907,220,003.99/642,538.12
  6. Step 6: Final answer
    x = 535,232.40

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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.