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Finding the Fourth Proportional to 1,131.78, 1,700.88 and 669.65

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Solution

The fourth proportional to 1,131.78, 1,700.88 and 669.65 is: 1,006.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.78 : 1,700.88 = 669.65 : x
  2. Step 2: Convert to fraction form
    1,131.78/1,700.88 = 669.65/x
  3. Step 3: Cross multiply
    1,131.78x = 1,700.88 × 669.65
  4. Step 4: Simplify right side
    1,131.78x = 1,138,985.79
  5. Step 5: Solve for x
    x = 1,138,985.79/1,131.78
  6. Step 6: Final answer
    x = 1,006.37

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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.