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Finding the Fourth Proportional to 391,727.43, 540,384.87 and 255,840.91

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Solution

The fourth proportional to 391,727.43, 540,384.87 and 255,840.91 is: 352,930.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,727.43 : 540,384.87 = 255,840.91 : x
  2. Step 2: Convert to fraction form
    391,727.43/540,384.87 = 255,840.91/x
  3. Step 3: Cross multiply
    391,727.43x = 540,384.87 × 255,840.91
  4. Step 4: Simplify right side
    391,727.43x = 138,252,556,891.03
  5. Step 5: Solve for x
    x = 138,252,556,891.03/391,727.43
  6. Step 6: Final answer
    x = 352,930.50

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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.