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Finding the Fourth Proportional to 1,103.74, 1,656.15 and 665.11

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Solution

The fourth proportional to 1,103.74, 1,656.15 and 665.11 is: 997.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.74 : 1,656.15 = 665.11 : x
  2. Step 2: Convert to fraction form
    1,103.74/1,656.15 = 665.11/x
  3. Step 3: Cross multiply
    1,103.74x = 1,656.15 × 665.11
  4. Step 4: Simplify right side
    1,103.74x = 1,101,521.93
  5. Step 5: Solve for x
    x = 1,101,521.93/1,103.74
  6. Step 6: Final answer
    x = 997.99

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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.