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Finding the Fourth Proportional to 103,479.90, 155,219.85 and 71,987.10

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Solution

The fourth proportional to 103,479.90, 155,219.85 and 71,987.10 is: 107,980.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,479.90 : 155,219.85 = 71,987.10 : x
  2. Step 2: Convert to fraction form
    103,479.90/155,219.85 = 71,987.10/x
  3. Step 3: Cross multiply
    103,479.90x = 155,219.85 × 71,987.10
  4. Step 4: Simplify right side
    103,479.90x = 11,173,826,863.94
  5. Step 5: Solve for x
    x = 11,173,826,863.94/103,479.90
  6. Step 6: Final answer
    x = 107,980.65

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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.