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Finding the Fourth Proportional to 1,224.14, 1,688.69 and 775.25

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Solution

The fourth proportional to 1,224.14, 1,688.69 and 775.25 is: 1,069.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.14 : 1,688.69 = 775.25 : x
  2. Step 2: Convert to fraction form
    1,224.14/1,688.69 = 775.25/x
  3. Step 3: Cross multiply
    1,224.14x = 1,688.69 × 775.25
  4. Step 4: Simplify right side
    1,224.14x = 1,309,156.92
  5. Step 5: Solve for x
    x = 1,309,156.92/1,224.14
  6. Step 6: Final answer
    x = 1,069.45

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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.