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Finding the Fourth Proportional to 520,021.20, 780,031.80 and 485,029.20

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Solution

The fourth proportional to 520,021.20, 780,031.80 and 485,029.20 is: 727,543.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,021.20 : 780,031.80 = 485,029.20 : x
  2. Step 2: Convert to fraction form
    520,021.20/780,031.80 = 485,029.20/x
  3. Step 3: Cross multiply
    520,021.20x = 780,031.80 × 485,029.20
  4. Step 4: Simplify right side
    520,021.20x = 378,338,199,928.56
  5. Step 5: Solve for x
    x = 378,338,199,928.56/520,021.20
  6. Step 6: Final answer
    x = 727,543.80

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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.