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Finding the Fourth Proportional to 715,261.44, 987,067.44 and 392,978.20

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Solution

The fourth proportional to 715,261.44, 987,067.44 and 392,978.20 is: 542,313.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,261.44 : 987,067.44 = 392,978.20 : x
  2. Step 2: Convert to fraction form
    715,261.44/987,067.44 = 392,978.20/x
  3. Step 3: Cross multiply
    715,261.44x = 987,067.44 × 392,978.20
  4. Step 4: Simplify right side
    715,261.44x = 387,895,985,849.81
  5. Step 5: Solve for x
    x = 387,895,985,849.81/715,261.44
  6. Step 6: Final answer
    x = 542,313.57

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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.