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Finding the Fourth Proportional to 720,398.12, 994,064.82 and 398,089

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Solution

The fourth proportional to 720,398.12, 994,064.82 and 398,089 is: 549,316.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,398.12 : 994,064.82 = 398,089 : x
  2. Step 2: Convert to fraction form
    720,398.12/994,064.82 = 398,089/x
  3. Step 3: Cross multiply
    720,398.12x = 994,064.82 × 398,089
  4. Step 4: Simplify right side
    720,398.12x = 395,726,270,128.98
  5. Step 5: Solve for x
    x = 395,726,270,128.98/720,398.12
  6. Step 6: Final answer
    x = 549,316.08

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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.