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Finding the Fourth Proportional to 661,546.32, 991,067.36 and 390,864.96

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Solution

The fourth proportional to 661,546.32, 991,067.36 and 390,864.96 is: 585,557.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,546.32 : 991,067.36 = 390,864.96 : x
  2. Step 2: Convert to fraction form
    661,546.32/991,067.36 = 390,864.96/x
  3. Step 3: Cross multiply
    661,546.32x = 991,067.36 × 390,864.96
  4. Step 4: Simplify right side
    661,546.32x = 387,373,504,023.71
  5. Step 5: Solve for x
    x = 387,373,504,023.71/661,546.32
  6. Step 6: Final answer
    x = 585,557.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.