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Finding the Fourth Proportional to 720,844.72, 994,725.52 and 398,536

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Solution

The fourth proportional to 720,844.72, 994,725.52 and 398,536 is: 549,957.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,844.72 : 994,725.52 = 398,536 : x
  2. Step 2: Convert to fraction form
    720,844.72/994,725.52 = 398,536/x
  3. Step 3: Cross multiply
    720,844.72x = 994,725.52 × 398,536
  4. Step 4: Simplify right side
    720,844.72x = 396,433,929,838.72
  5. Step 5: Solve for x
    x = 396,433,929,838.72/720,844.72
  6. Step 6: Final answer
    x = 549,957.46

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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.