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Finding the Fourth Proportional to 661,690.11, 992,000.81 and 256,673.21

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Solution

The fourth proportional to 661,690.11, 992,000.81 and 256,673.21 is: 384,802.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,690.11 : 992,000.81 = 256,673.21 : x
  2. Step 2: Convert to fraction form
    661,690.11/992,000.81 = 256,673.21/x
  3. Step 3: Cross multiply
    661,690.11x = 992,000.81 × 256,673.21
  4. Step 4: Simplify right side
    661,690.11x = 254,620,027,906.98
  5. Step 5: Solve for x
    x = 254,620,027,906.98/661,690.11
  6. Step 6: Final answer
    x = 384,802.53

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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.