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Finding the Fourth Proportional to 1,135.94, 1,690.98 and 1,129.76

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Solution

The fourth proportional to 1,135.94, 1,690.98 and 1,129.76 is: 1,681.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.94 : 1,690.98 = 1,129.76 : x
  2. Step 2: Convert to fraction form
    1,135.94/1,690.98 = 1,129.76/x
  3. Step 3: Cross multiply
    1,135.94x = 1,690.98 × 1,129.76
  4. Step 4: Simplify right side
    1,135.94x = 1,910,395.21
  5. Step 5: Solve for x
    x = 1,910,395.21/1,135.94
  6. Step 6: Final answer
    x = 1,681.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.