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Finding the Fourth Proportional to 720,376.32, 994,115.52 and 398,108.80

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Solution

The fourth proportional to 720,376.32, 994,115.52 and 398,108.80 is: 549,388.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,376.32 : 994,115.52 = 398,108.80 : x
  2. Step 2: Convert to fraction form
    720,376.32/994,115.52 = 398,108.80/x
  3. Step 3: Cross multiply
    720,376.32x = 994,115.52 × 398,108.80
  4. Step 4: Simplify right side
    720,376.32x = 395,766,136,728.58
  5. Step 5: Solve for x
    x = 395,766,136,728.58/720,376.32
  6. Step 6: Final answer
    x = 549,388.04

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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.