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Finding the Fourth Proportional to 318,979.20, 478,031.40 and 259,930.20

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Solution

The fourth proportional to 318,979.20, 478,031.40 and 259,930.20 is: 389,538.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,979.20 : 478,031.40 = 259,930.20 : x
  2. Step 2: Convert to fraction form
    318,979.20/478,031.40 = 259,930.20/x
  3. Step 3: Cross multiply
    318,979.20x = 478,031.40 × 259,930.20
  4. Step 4: Simplify right side
    318,979.20x = 124,254,797,408.28
  5. Step 5: Solve for x
    x = 124,254,797,408.28/318,979.20
  6. Step 6: Final answer
    x = 389,538.87

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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.