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Finding the Fourth Proportional to 720,789.42, 994,637 and 398,503.38

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Solution

The fourth proportional to 720,789.42, 994,637 and 398,503.38 is: 549,905.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,789.42 : 994,637 = 398,503.38 : x
  2. Step 2: Convert to fraction form
    720,789.42/994,637 = 398,503.38/x
  3. Step 3: Cross multiply
    720,789.42x = 994,637 × 398,503.38
  4. Step 4: Simplify right side
    720,789.42x = 396,366,206,373.06
  5. Step 5: Solve for x
    x = 396,366,206,373.06/720,789.42
  6. Step 6: Final answer
    x = 549,905.69

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1.5x scale

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.