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Finding the Fourth Proportional to 907.61, 1,361.28 and 291.25

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Solution

The fourth proportional to 907.61, 1,361.28 and 291.25 is: 436.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.61 : 1,361.28 = 291.25 : x
  2. Step 2: Convert to fraction form
    907.61/1,361.28 = 291.25/x
  3. Step 3: Cross multiply
    907.61x = 1,361.28 × 291.25
  4. Step 4: Simplify right side
    907.61x = 396,472.80
  5. Step 5: Solve for x
    x = 396,472.80/907.61
  6. Step 6: Final answer
    x = 436.83

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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.