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Finding the Fourth Proportional to 129,855.97, 179,210.30 and 72,506.58

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Solution

The fourth proportional to 129,855.97, 179,210.30 and 72,506.58 is: 100,064.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,855.97 : 179,210.30 = 72,506.58 : x
  2. Step 2: Convert to fraction form
    129,855.97/179,210.30 = 72,506.58/x
  3. Step 3: Cross multiply
    129,855.97x = 179,210.30 × 72,506.58
  4. Step 4: Simplify right side
    129,855.97x = 12,993,924,919.20
  5. Step 5: Solve for x
    x = 12,993,924,919.20/129,855.97
  6. Step 6: Final answer
    x = 100,064.13

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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.