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Finding the Fourth Proportional to 260,840.70, 391,390.65 and 103,074.30

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Solution

The fourth proportional to 260,840.70, 391,390.65 and 103,074.30 is: 154,662.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,840.70 : 391,390.65 = 103,074.30 : x
  2. Step 2: Convert to fraction form
    260,840.70/391,390.65 = 103,074.30/x
  3. Step 3: Cross multiply
    260,840.70x = 391,390.65 × 103,074.30
  4. Step 4: Simplify right side
    260,840.70x = 40,342,317,275.30
  5. Step 5: Solve for x
    x = 40,342,317,275.30/260,840.70
  6. Step 6: Final answer
    x = 154,662.66

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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.