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Finding the Fourth Proportional to 720,377.32, 994,116.90 and 398,109.80

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Solution

The fourth proportional to 720,377.32, 994,116.90 and 398,109.80 is: 549,389.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,377.32 : 994,116.90 = 398,109.80 : x
  2. Step 2: Convert to fraction form
    720,377.32/994,116.90 = 398,109.80/x
  3. Step 3: Cross multiply
    720,377.32x = 994,116.90 × 398,109.80
  4. Step 4: Simplify right side
    720,377.32x = 395,767,680,235.62
  5. Step 5: Solve for x
    x = 395,767,680,235.62/720,377.32
  6. Step 6: Final answer
    x = 549,389.42

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1.5x scale

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.