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Finding the Fourth Proportional to 391,917.59, 540,646.89 and 256,031.08

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Solution

The fourth proportional to 391,917.59, 540,646.89 and 256,031.08 is: 353,192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,917.59 : 540,646.89 = 256,031.08 : x
  2. Step 2: Convert to fraction form
    391,917.59/540,646.89 = 256,031.08/x
  3. Step 3: Cross multiply
    391,917.59x = 540,646.89 × 256,031.08
  4. Step 4: Simplify right side
    391,917.59x = 138,422,405,153.65
  5. Step 5: Solve for x
    x = 138,422,405,153.65/391,917.59
  6. Step 6: Final answer
    x = 353,192.63

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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.