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Finding the Fourth Proportional to 1,136.20, 1,700.70 and 1,100.20

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Solution

The fourth proportional to 1,136.20, 1,700.70 and 1,100.20 is: 1,646.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.20 : 1,700.70 = 1,100.20 : x
  2. Step 2: Convert to fraction form
    1,136.20/1,700.70 = 1,100.20/x
  3. Step 3: Cross multiply
    1,136.20x = 1,700.70 × 1,100.20
  4. Step 4: Simplify right side
    1,136.20x = 1,871,110.14
  5. Step 5: Solve for x
    x = 1,871,110.14/1,136.20
  6. Step 6: Final answer
    x = 1,646.81

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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.