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Finding the Fourth Proportional to 1,269.90, 1,905.12 and 749.70

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Solution

The fourth proportional to 1,269.90, 1,905.12 and 749.70 is: 1,124.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.90 : 1,905.12 = 749.70 : x
  2. Step 2: Convert to fraction form
    1,269.90/1,905.12 = 749.70/x
  3. Step 3: Cross multiply
    1,269.90x = 1,905.12 × 749.70
  4. Step 4: Simplify right side
    1,269.90x = 1,428,268.46
  5. Step 5: Solve for x
    x = 1,428,268.46/1,269.90
  6. Step 6: Final answer
    x = 1,124.71

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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.