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Finding the Fourth Proportional to 1,187.76, 1,639.10 and 663.90

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Solution

The fourth proportional to 1,187.76, 1,639.10 and 663.90 is: 916.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.76 : 1,639.10 = 663.90 : x
  2. Step 2: Convert to fraction form
    1,187.76/1,639.10 = 663.90/x
  3. Step 3: Cross multiply
    1,187.76x = 1,639.10 × 663.90
  4. Step 4: Simplify right side
    1,187.76x = 1,088,198.49
  5. Step 5: Solve for x
    x = 1,088,198.49/1,187.76
  6. Step 6: Final answer
    x = 916.18

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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.