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Finding the Fourth Proportional to 520,078.90, 780,118.35 and 342,786.10

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Solution

The fourth proportional to 520,078.90, 780,118.35 and 342,786.10 is: 514,179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,078.90 : 780,118.35 = 342,786.10 : x
  2. Step 2: Convert to fraction form
    520,078.90/780,118.35 = 342,786.10/x
  3. Step 3: Cross multiply
    520,078.90x = 780,118.35 × 342,786.10
  4. Step 4: Simplify right side
    520,078.90x = 267,413,726,734.94
  5. Step 5: Solve for x
    x = 267,413,726,734.94/520,078.90
  6. Step 6: Final answer
    x = 514,179.15

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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.