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Finding the Fourth Proportional to 720,885.72, 994,782.15 and 398,576.46

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Solution

The fourth proportional to 720,885.72, 994,782.15 and 398,576.46 is: 550,013.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,885.72 : 994,782.15 = 398,576.46 : x
  2. Step 2: Convert to fraction form
    720,885.72/994,782.15 = 398,576.46/x
  3. Step 3: Cross multiply
    720,885.72x = 994,782.15 × 398,576.46
  4. Step 4: Simplify right side
    720,885.72x = 396,496,747,818.19
  5. Step 5: Solve for x
    x = 396,496,747,818.19/720,885.72
  6. Step 6: Final answer
    x = 550,013.32

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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.