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Finding the Fourth Proportional to 720,939.12, 994,885.60 and 398,642.12

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Solution

The fourth proportional to 720,939.12, 994,885.60 and 398,642.12 is: 550,120.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,939.12 : 994,885.60 = 398,642.12 : x
  2. Step 2: Convert to fraction form
    720,939.12/994,885.60 = 398,642.12/x
  3. Step 3: Cross multiply
    720,939.12x = 994,885.60 × 398,642.12
  4. Step 4: Simplify right side
    720,939.12x = 396,603,304,741.47
  5. Step 5: Solve for x
    x = 396,603,304,741.47/720,939.12
  6. Step 6: Final answer
    x = 550,120.38

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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.