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Finding the Fourth Proportional to 391,906.74, 540,946.28 and 255,961.30

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Solution

The fourth proportional to 391,906.74, 540,946.28 and 255,961.30 is: 353,301.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,906.74 : 540,946.28 = 255,961.30 : x
  2. Step 2: Convert to fraction form
    391,906.74/540,946.28 = 255,961.30/x
  3. Step 3: Cross multiply
    391,906.74x = 540,946.28 × 255,961.30
  4. Step 4: Simplify right side
    391,906.74x = 138,461,313,058.96
  5. Step 5: Solve for x
    x = 138,461,313,058.96/391,906.74
  6. Step 6: Final answer
    x = 353,301.69

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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.