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Finding the Fourth Proportional to 1,136.15, 1,568 and 763.90

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Solution

The fourth proportional to 1,136.15, 1,568 and 763.90 is: 1,054.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.15 : 1,568 = 763.90 : x
  2. Step 2: Convert to fraction form
    1,136.15/1,568 = 763.90/x
  3. Step 3: Cross multiply
    1,136.15x = 1,568 × 763.90
  4. Step 4: Simplify right side
    1,136.15x = 1,197,795.20
  5. Step 5: Solve for x
    x = 1,197,795.20/1,136.15
  6. Step 6: Final answer
    x = 1,054.26

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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.