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Finding the Fourth Proportional to 261,203.31, 391,738.32 and 81,253.55

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Solution

The fourth proportional to 261,203.31, 391,738.32 and 81,253.55 is: 121,859.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,203.31 : 391,738.32 = 81,253.55 : x
  2. Step 2: Convert to fraction form
    261,203.31/391,738.32 = 81,253.55/x
  3. Step 3: Cross multiply
    261,203.31x = 391,738.32 × 81,253.55
  4. Step 4: Simplify right side
    261,203.31x = 31,830,127,212.34
  5. Step 5: Solve for x
    x = 31,830,127,212.34/261,203.31
  6. Step 6: Final answer
    x = 121,859.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.