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Finding the Fourth Proportional to 79,143.48, 118,648.80 and 54,122.58

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Solution

The fourth proportional to 79,143.48, 118,648.80 and 54,122.58 is: 81,138.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,143.48 : 118,648.80 = 54,122.58 : x
  2. Step 2: Convert to fraction form
    79,143.48/118,648.80 = 54,122.58/x
  3. Step 3: Cross multiply
    79,143.48x = 118,648.80 × 54,122.58
  4. Step 4: Simplify right side
    79,143.48x = 6,421,579,169.90
  5. Step 5: Solve for x
    x = 6,421,579,169.90/79,143.48
  6. Step 6: Final answer
    x = 81,138.45

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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.