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Finding the Fourth Proportional to 103,371.84, 142,721.60 and 79,454.40

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Solution

The fourth proportional to 103,371.84, 142,721.60 and 79,454.40 is: 109,699.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,371.84 : 142,721.60 = 79,454.40 : x
  2. Step 2: Convert to fraction form
    103,371.84/142,721.60 = 79,454.40/x
  3. Step 3: Cross multiply
    103,371.84x = 142,721.60 × 79,454.40
  4. Step 4: Simplify right side
    103,371.84x = 11,339,859,095.04
  5. Step 5: Solve for x
    x = 11,339,859,095.04/103,371.84
  6. Step 6: Final answer
    x = 109,699.69

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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.