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Finding the Fourth Proportional to 720,783.94, 994,702.61 and 398,514.85

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Solution

The fourth proportional to 720,783.94, 994,702.61 and 398,514.85 is: 549,961.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,783.94 : 994,702.61 = 398,514.85 : x
  2. Step 2: Convert to fraction form
    720,783.94/994,702.61 = 398,514.85/x
  3. Step 3: Cross multiply
    720,783.94x = 994,702.61 × 398,514.85
  4. Step 4: Simplify right side
    720,783.94x = 396,403,761,418.76
  5. Step 5: Solve for x
    x = 396,403,761,418.76/720,783.94
  6. Step 6: Final answer
    x = 549,961.98

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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.