Home / 718,490.45-991,540.75-391,821.33

Finding the Fourth Proportional to 718,490.45, 991,540.75 and 391,821.33

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Solution

The fourth proportional to 718,490.45, 991,540.75 and 391,821.33 is: 540,726.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,490.45 : 991,540.75 = 391,821.33 : x
  2. Step 2: Convert to fraction form
    718,490.45/991,540.75 = 391,821.33/x
  3. Step 3: Cross multiply
    718,490.45x = 991,540.75 × 391,821.33
  4. Step 4: Simplify right side
    718,490.45x = 388,506,815,414.20
  5. Step 5: Solve for x
    x = 388,506,815,414.20/718,490.45
  6. Step 6: Final answer
    x = 540,726.48

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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.