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Finding the Fourth Proportional to 103,520.82, 142,929.55 and 79,279.01

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Solution

The fourth proportional to 103,520.82, 142,929.55 and 79,279.01 is: 109,459.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,520.82 : 142,929.55 = 79,279.01 : x
  2. Step 2: Convert to fraction form
    103,520.82/142,929.55 = 79,279.01/x
  3. Step 3: Cross multiply
    103,520.82x = 142,929.55 × 79,279.01
  4. Step 4: Simplify right side
    103,520.82x = 11,331,313,223.75
  5. Step 5: Solve for x
    x = 11,331,313,223.75/103,520.82
  6. Step 6: Final answer
    x = 109,459.27

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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.