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Finding the Fourth Proportional to 720,519.62, 994,368.54 and 398,222.78

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Solution

The fourth proportional to 720,519.62, 994,368.54 and 398,222.78 is: 549,575.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,519.62 : 994,368.54 = 398,222.78 : x
  2. Step 2: Convert to fraction form
    720,519.62/994,368.54 = 398,222.78/x
  3. Step 3: Cross multiply
    720,519.62x = 994,368.54 × 398,222.78
  4. Step 4: Simplify right side
    720,519.62x = 395,980,204,343.34
  5. Step 5: Solve for x
    x = 395,980,204,343.34/720,519.62
  6. Step 6: Final answer
    x = 549,575.88

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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.