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Finding the Fourth Proportional to 1,188.10, 1,638.09 and 907.91

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Solution

The fourth proportional to 1,188.10, 1,638.09 and 907.91 is: 1,251.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.10 : 1,638.09 = 907.91 : x
  2. Step 2: Convert to fraction form
    1,188.10/1,638.09 = 907.91/x
  3. Step 3: Cross multiply
    1,188.10x = 1,638.09 × 907.91
  4. Step 4: Simplify right side
    1,188.10x = 1,487,236.24
  5. Step 5: Solve for x
    x = 1,487,236.24/1,188.10
  6. Step 6: Final answer
    x = 1,251.78

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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.