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Finding the Fourth Proportional to 100,480.48, 138,659.48 and 56,872.10

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Solution

The fourth proportional to 100,480.48, 138,659.48 and 56,872.10 is: 78,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,480.48 : 138,659.48 = 56,872.10 : x
  2. Step 2: Convert to fraction form
    100,480.48/138,659.48 = 56,872.10/x
  3. Step 3: Cross multiply
    100,480.48x = 138,659.48 × 56,872.10
  4. Step 4: Simplify right side
    100,480.48x = 7,885,855,621.41
  5. Step 5: Solve for x
    x = 7,885,855,621.41/100,480.48
  6. Step 6: Final answer
    x = 78,481.47

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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.