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Finding the Fourth Proportional to 87,486.78, 120,731.79 and 51,195.21

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Solution

The fourth proportional to 87,486.78, 120,731.79 and 51,195.21 is: 70,649.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,486.78 : 120,731.79 = 51,195.21 : x
  2. Step 2: Convert to fraction form
    87,486.78/120,731.79 = 51,195.21/x
  3. Step 3: Cross multiply
    87,486.78x = 120,731.79 × 51,195.21
  4. Step 4: Simplify right side
    87,486.78x = 6,180,888,675.07
  5. Step 5: Solve for x
    x = 6,180,888,675.07/87,486.78
  6. Step 6: Final answer
    x = 70,649.40

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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.