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Finding the Fourth Proportional to 1,089.40, 1,503 and 696.66

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Solution

The fourth proportional to 1,089.40, 1,503 and 696.66 is: 961.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.40 : 1,503 = 696.66 : x
  2. Step 2: Convert to fraction form
    1,089.40/1,503 = 696.66/x
  3. Step 3: Cross multiply
    1,089.40x = 1,503 × 696.66
  4. Step 4: Simplify right side
    1,089.40x = 1,047,079.98
  5. Step 5: Solve for x
    x = 1,047,079.98/1,089.40
  6. Step 6: Final answer
    x = 961.15

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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.