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Finding the Fourth Proportional to 720,798.98, 994,616.61 and 398,465.78

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Solution

The fourth proportional to 720,798.98, 994,616.61 and 398,465.78 is: 549,835.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,798.98 : 994,616.61 = 398,465.78 : x
  2. Step 2: Convert to fraction form
    720,798.98/994,616.61 = 398,465.78/x
  3. Step 3: Cross multiply
    720,798.98x = 994,616.61 × 398,465.78
  4. Step 4: Simplify right side
    720,798.98x = 396,320,683,304.61
  5. Step 5: Solve for x
    x = 396,320,683,304.61/720,798.98
  6. Step 6: Final answer
    x = 549,835.24

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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.