Home / 260,020.80-390,031.20-212,781.60

Finding the Fourth Proportional to 260,020.80, 390,031.20 and 212,781.60

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Solution

The fourth proportional to 260,020.80, 390,031.20 and 212,781.60 is: 319,172.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,020.80 : 390,031.20 = 212,781.60 : x
  2. Step 2: Convert to fraction form
    260,020.80/390,031.20 = 212,781.60/x
  3. Step 3: Cross multiply
    260,020.80x = 390,031.20 × 212,781.60
  4. Step 4: Simplify right side
    260,020.80x = 82,991,462,785.92
  5. Step 5: Solve for x
    x = 82,991,462,785.92/260,020.80
  6. Step 6: Final answer
    x = 319,172.40

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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.