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Finding the Fourth Proportional to 520,808.40, 781,212.60 and 515,278.80

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Solution

The fourth proportional to 520,808.40, 781,212.60 and 515,278.80 is: 772,918.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,808.40 : 781,212.60 = 515,278.80 : x
  2. Step 2: Convert to fraction form
    520,808.40/781,212.60 = 515,278.80/x
  3. Step 3: Cross multiply
    520,808.40x = 781,212.60 × 515,278.80
  4. Step 4: Simplify right side
    520,808.40x = 402,542,291,072.88
  5. Step 5: Solve for x
    x = 402,542,291,072.88/520,808.40
  6. Step 6: Final answer
    x = 772,918.20

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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.