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Finding the Fourth Proportional to 720,742.89, 994,575.23 and 398,427.61

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Solution

The fourth proportional to 720,742.89, 994,575.23 and 398,427.61 is: 549,802.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,742.89 : 994,575.23 = 398,427.61 : x
  2. Step 2: Convert to fraction form
    720,742.89/994,575.23 = 398,427.61/x
  3. Step 3: Cross multiply
    720,742.89x = 994,575.23 × 398,427.61
  4. Step 4: Simplify right side
    720,742.89x = 396,266,231,855.03
  5. Step 5: Solve for x
    x = 396,266,231,855.03/720,742.89
  6. Step 6: Final answer
    x = 549,802.49

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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.