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Finding the Fourth Proportional to 1,381.04, 1,905.80 and 751.56

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Solution

The fourth proportional to 1,381.04, 1,905.80 and 751.56 is: 1,037.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.04 : 1,905.80 = 751.56 : x
  2. Step 2: Convert to fraction form
    1,381.04/1,905.80 = 751.56/x
  3. Step 3: Cross multiply
    1,381.04x = 1,905.80 × 751.56
  4. Step 4: Simplify right side
    1,381.04x = 1,432,323.05
  5. Step 5: Solve for x
    x = 1,432,323.05/1,381.04
  6. Step 6: Final answer
    x = 1,037.13

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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.