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Finding the Fourth Proportional to 260,031.20, 390,046.80 and 231,000.80

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Solution

The fourth proportional to 260,031.20, 390,046.80 and 231,000.80 is: 346,501.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,031.20 : 390,046.80 = 231,000.80 : x
  2. Step 2: Convert to fraction form
    260,031.20/390,046.80 = 231,000.80/x
  3. Step 3: Cross multiply
    260,031.20x = 390,046.80 × 231,000.80
  4. Step 4: Simplify right side
    260,031.20x = 90,101,122,837.44
  5. Step 5: Solve for x
    x = 90,101,122,837.44/260,031.20
  6. Step 6: Final answer
    x = 346,501.20

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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.