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Finding the Fourth Proportional to 480,020.80, 720,031.20 and 386,708.80

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Solution

The fourth proportional to 480,020.80, 720,031.20 and 386,708.80 is: 580,063.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,020.80 : 720,031.20 = 386,708.80 : x
  2. Step 2: Convert to fraction form
    480,020.80/720,031.20 = 386,708.80/x
  3. Step 3: Cross multiply
    480,020.80x = 720,031.20 × 386,708.80
  4. Step 4: Simplify right side
    480,020.80x = 278,442,401,314.56
  5. Step 5: Solve for x
    x = 278,442,401,314.56/480,020.80
  6. Step 6: Final answer
    x = 580,063.20

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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.