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Finding the Fourth Proportional to 1,207.86, 1,666.85 and 683.99

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Solution

The fourth proportional to 1,207.86, 1,666.85 and 683.99 is: 943.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.86 : 1,666.85 = 683.99 : x
  2. Step 2: Convert to fraction form
    1,207.86/1,666.85 = 683.99/x
  3. Step 3: Cross multiply
    1,207.86x = 1,666.85 × 683.99
  4. Step 4: Simplify right side
    1,207.86x = 1,140,108.73
  5. Step 5: Solve for x
    x = 1,140,108.73/1,207.86
  6. Step 6: Final answer
    x = 943.91

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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.