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Finding the Fourth Proportional to 1,284.77, 1,773.42 and 989.66

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Solution

The fourth proportional to 1,284.77, 1,773.42 and 989.66 is: 1,366.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.77 : 1,773.42 = 989.66 : x
  2. Step 2: Convert to fraction form
    1,284.77/1,773.42 = 989.66/x
  3. Step 3: Cross multiply
    1,284.77x = 1,773.42 × 989.66
  4. Step 4: Simplify right side
    1,284.77x = 1,755,082.84
  5. Step 5: Solve for x
    x = 1,755,082.84/1,284.77
  6. Step 6: Final answer
    x = 1,366.07

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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.