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Finding the Fourth Proportional to 720,314.52, 994,020.36 and 398,017.80

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Solution

The fourth proportional to 720,314.52, 994,020.36 and 398,017.80 is: 549,257.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,314.52 : 994,020.36 = 398,017.80 : x
  2. Step 2: Convert to fraction form
    720,314.52/994,020.36 = 398,017.80/x
  3. Step 3: Cross multiply
    720,314.52x = 994,020.36 × 398,017.80
  4. Step 4: Simplify right side
    720,314.52x = 395,637,796,842.41
  5. Step 5: Solve for x
    x = 395,637,796,842.41/720,314.52
  6. Step 6: Final answer
    x = 549,257.01

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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.