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Finding the Fourth Proportional to 720,509.80, 1,081,379.10 and 321,764.20

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Solution

The fourth proportional to 720,509.80, 1,081,379.10 and 321,764.20 is: 482,920.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,509.80 : 1,081,379.10 = 321,764.20 : x
  2. Step 2: Convert to fraction form
    720,509.80/1,081,379.10 = 321,764.20/x
  3. Step 3: Cross multiply
    720,509.80x = 1,081,379.10 × 321,764.20
  4. Step 4: Simplify right side
    720,509.80x = 347,949,081,008.22
  5. Step 5: Solve for x
    x = 347,949,081,008.22/720,509.80
  6. Step 6: Final answer
    x = 482,920.68

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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.