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Finding the Fourth Proportional to 1,145.05, 1,718.53 and 885.75

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Solution

The fourth proportional to 1,145.05, 1,718.53 and 885.75 is: 1,329.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.05 : 1,718.53 = 885.75 : x
  2. Step 2: Convert to fraction form
    1,145.05/1,718.53 = 885.75/x
  3. Step 3: Cross multiply
    1,145.05x = 1,718.53 × 885.75
  4. Step 4: Simplify right side
    1,145.05x = 1,522,187.95
  5. Step 5: Solve for x
    x = 1,522,187.95/1,145.05
  6. Step 6: Final answer
    x = 1,329.36

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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.