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Finding the Fourth Proportional to 520,630.72, 780,387.18 and 220,858.36

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Solution

The fourth proportional to 520,630.72, 780,387.18 and 220,858.36 is: 331,050.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,630.72 : 780,387.18 = 220,858.36 : x
  2. Step 2: Convert to fraction form
    520,630.72/780,387.18 = 220,858.36/x
  3. Step 3: Cross multiply
    520,630.72x = 780,387.18 × 220,858.36
  4. Step 4: Simplify right side
    520,630.72x = 172,355,032,739.83
  5. Step 5: Solve for x
    x = 172,355,032,739.83/520,630.72
  6. Step 6: Final answer
    x = 331,050.45

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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.