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Finding the Fourth Proportional to 1,136, 1,567.68 and 722.24

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Solution

The fourth proportional to 1,136, 1,567.68 and 722.24 is: 996.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136 : 1,567.68 = 722.24 : x
  2. Step 2: Convert to fraction form
    1,136/1,567.68 = 722.24/x
  3. Step 3: Cross multiply
    1,136x = 1,567.68 × 722.24
  4. Step 4: Simplify right side
    1,136x = 1,132,241.20
  5. Step 5: Solve for x
    x = 1,132,241.20/1,136
  6. Step 6: Final answer
    x = 996.69

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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.