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Finding the Fourth Proportional to 720,618.02, 994,410.12 and 398,308.89

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Solution

The fourth proportional to 720,618.02, 994,410.12 and 398,308.89 is: 549,642.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,618.02 : 994,410.12 = 398,308.89 : x
  2. Step 2: Convert to fraction form
    720,618.02/994,410.12 = 398,308.89/x
  3. Step 3: Cross multiply
    720,618.02x = 994,410.12 × 398,308.89
  4. Step 4: Simplify right side
    720,618.02x = 396,082,394,084.18
  5. Step 5: Solve for x
    x = 396,082,394,084.18/720,618.02
  6. Step 6: Final answer
    x = 549,642.65

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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.