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Finding the Fourth Proportional to 1,222.29, 1,689.12 and 908.01

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Solution

The fourth proportional to 1,222.29, 1,689.12 and 908.01 is: 1,254.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.29 : 1,689.12 = 908.01 : x
  2. Step 2: Convert to fraction form
    1,222.29/1,689.12 = 908.01/x
  3. Step 3: Cross multiply
    1,222.29x = 1,689.12 × 908.01
  4. Step 4: Simplify right side
    1,222.29x = 1,533,737.85
  5. Step 5: Solve for x
    x = 1,533,737.85/1,222.29
  6. Step 6: Final answer
    x = 1,254.81

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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.