Home / 717,977.88-990,805.20-391,290.48

Finding the Fourth Proportional to 717,977.88, 990,805.20 and 391,290.48

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Solution

The fourth proportional to 717,977.88, 990,805.20 and 391,290.48 is: 539,978.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,977.88 : 990,805.20 = 391,290.48 : x
  2. Step 2: Convert to fraction form
    717,977.88/990,805.20 = 391,290.48/x
  3. Step 3: Cross multiply
    717,977.88x = 990,805.20 × 391,290.48
  4. Step 4: Simplify right side
    717,977.88x = 387,692,642,294.50
  5. Step 5: Solve for x
    x = 387,692,642,294.50/717,977.88
  6. Step 6: Final answer
    x = 539,978.53

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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.