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Finding the Fourth Proportional to 1,107.19, 1,656.90 and 909.82

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Solution

The fourth proportional to 1,107.19, 1,656.90 and 909.82 is: 1,361.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.19 : 1,656.90 = 909.82 : x
  2. Step 2: Convert to fraction form
    1,107.19/1,656.90 = 909.82/x
  3. Step 3: Cross multiply
    1,107.19x = 1,656.90 × 909.82
  4. Step 4: Simplify right side
    1,107.19x = 1,507,480.76
  5. Step 5: Solve for x
    x = 1,507,480.76/1,107.19
  6. Step 6: Final answer
    x = 1,361.54

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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.