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Finding the Fourth Proportional to 907.84, 1,361.80 and 291.55

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Solution

The fourth proportional to 907.84, 1,361.80 and 291.55 is: 437.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.84 : 1,361.80 = 291.55 : x
  2. Step 2: Convert to fraction form
    907.84/1,361.80 = 291.55/x
  3. Step 3: Cross multiply
    907.84x = 1,361.80 × 291.55
  4. Step 4: Simplify right side
    907.84x = 397,030.66
  5. Step 5: Solve for x
    x = 397,030.66/907.84
  6. Step 6: Final answer
    x = 437.33

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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.