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Finding the Fourth Proportional to 1,136.14, 1,700.40 and 860.70

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Solution

The fourth proportional to 1,136.14, 1,700.40 and 860.70 is: 1,288.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.14 : 1,700.40 = 860.70 : x
  2. Step 2: Convert to fraction form
    1,136.14/1,700.40 = 860.70/x
  3. Step 3: Cross multiply
    1,136.14x = 1,700.40 × 860.70
  4. Step 4: Simplify right side
    1,136.14x = 1,463,534.28
  5. Step 5: Solve for x
    x = 1,463,534.28/1,136.14
  6. Step 6: Final answer
    x = 1,288.16

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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.