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Finding the Fourth Proportional to 720,619.77, 994,412.53 and 398,310.65

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Solution

The fourth proportional to 720,619.77, 994,412.53 and 398,310.65 is: 549,645.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,619.77 : 994,412.53 = 398,310.65 : x
  2. Step 2: Convert to fraction form
    720,619.77/994,412.53 = 398,310.65/x
  3. Step 3: Cross multiply
    720,619.77x = 994,412.53 × 398,310.65
  4. Step 4: Simplify right side
    720,619.77x = 396,085,101,192.45
  5. Step 5: Solve for x
    x = 396,085,101,192.45/720,619.77
  6. Step 6: Final answer
    x = 549,645.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.