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Finding the Fourth Proportional to 391,726.43, 540,383.49 and 255,839.91

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Solution

The fourth proportional to 391,726.43, 540,383.49 and 255,839.91 is: 352,929.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,726.43 : 540,383.49 = 255,839.91 : x
  2. Step 2: Convert to fraction form
    391,726.43/540,383.49 = 255,839.91/x
  3. Step 3: Cross multiply
    391,726.43x = 540,383.49 × 255,839.91
  4. Step 4: Simplify right side
    391,726.43x = 138,251,663,447.09
  5. Step 5: Solve for x
    x = 138,251,663,447.09/391,726.43
  6. Step 6: Final answer
    x = 352,929.12

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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.