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Finding the Fourth Proportional to 720,371.32, 994,108.62 and 398,103.80

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Solution

The fourth proportional to 720,371.32, 994,108.62 and 398,103.80 is: 549,381.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,371.32 : 994,108.62 = 398,103.80 : x
  2. Step 2: Convert to fraction form
    720,371.32/994,108.62 = 398,103.80/x
  3. Step 3: Cross multiply
    720,371.32x = 994,108.62 × 398,103.80
  4. Step 4: Simplify right side
    720,371.32x = 395,758,419,234.76
  5. Step 5: Solve for x
    x = 395,758,419,234.76/720,371.32
  6. Step 6: Final answer
    x = 549,381.14

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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.