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Finding the Fourth Proportional to 661,781.62, 992,578.70 and 212,443.32

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Solution

The fourth proportional to 661,781.62, 992,578.70 and 212,443.32 is: 318,634.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,781.62 : 992,578.70 = 212,443.32 : x
  2. Step 2: Convert to fraction form
    661,781.62/992,578.70 = 212,443.32/x
  3. Step 3: Cross multiply
    661,781.62x = 992,578.70 × 212,443.32
  4. Step 4: Simplify right side
    661,781.62x = 210,866,714,389.28
  5. Step 5: Solve for x
    x = 210,866,714,389.28/661,781.62
  6. Step 6: Final answer
    x = 318,634.89

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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.