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Finding the Fourth Proportional to 260,319.60, 390,479.76 and 80,408.88

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Solution

The fourth proportional to 260,319.60, 390,479.76 and 80,408.88 is: 120,613.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,319.60 : 390,479.76 = 80,408.88 : x
  2. Step 2: Convert to fraction form
    260,319.60/390,479.76 = 80,408.88/x
  3. Step 3: Cross multiply
    260,319.60x = 390,479.76 × 80,408.88
  4. Step 4: Simplify right side
    260,319.60x = 31,398,040,164.27
  5. Step 5: Solve for x
    x = 31,398,040,164.27/260,319.60
  6. Step 6: Final answer
    x = 120,613.43

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1.5x scale

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.