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Finding the Fourth Proportional to 1,133.38, 1,700.10 and 639.82

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Solution

The fourth proportional to 1,133.38, 1,700.10 and 639.82 is: 959.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.38 : 1,700.10 = 639.82 : x
  2. Step 2: Convert to fraction form
    1,133.38/1,700.10 = 639.82/x
  3. Step 3: Cross multiply
    1,133.38x = 1,700.10 × 639.82
  4. Step 4: Simplify right side
    1,133.38x = 1,087,757.98
  5. Step 5: Solve for x
    x = 1,087,757.98/1,133.38
  6. Step 6: Final answer
    x = 959.75

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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.