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Finding the Fourth Proportional to 1,225.80, 1,689.66 and 906.21

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Solution

The fourth proportional to 1,225.80, 1,689.66 and 906.21 is: 1,249.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.80 : 1,689.66 = 906.21 : x
  2. Step 2: Convert to fraction form
    1,225.80/1,689.66 = 906.21/x
  3. Step 3: Cross multiply
    1,225.80x = 1,689.66 × 906.21
  4. Step 4: Simplify right side
    1,225.80x = 1,531,186.79
  5. Step 5: Solve for x
    x = 1,531,186.79/1,225.80
  6. Step 6: Final answer
    x = 1,249.13

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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.