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Finding the Fourth Proportional to 907.61, 1,249.34 and 790.97

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Solution

The fourth proportional to 907.61, 1,249.34 and 790.97 is: 1,088.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.61 : 1,249.34 = 790.97 : x
  2. Step 2: Convert to fraction form
    907.61/1,249.34 = 790.97/x
  3. Step 3: Cross multiply
    907.61x = 1,249.34 × 790.97
  4. Step 4: Simplify right side
    907.61x = 988,180.26
  5. Step 5: Solve for x
    x = 988,180.26/907.61
  6. Step 6: Final answer
    x = 1,088.78

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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.