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Finding the Fourth Proportional to 1,385.28, 1,908.36 and 1,125

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Solution

The fourth proportional to 1,385.28, 1,908.36 and 1,125 is: 1,549.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.28 : 1,908.36 = 1,125 : x
  2. Step 2: Convert to fraction form
    1,385.28/1,908.36 = 1,125/x
  3. Step 3: Cross multiply
    1,385.28x = 1,908.36 × 1,125
  4. Step 4: Simplify right side
    1,385.28x = 2,146,905
  5. Step 5: Solve for x
    x = 2,146,905/1,385.28
  6. Step 6: Final answer
    x = 1,549.80

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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.