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Finding the Fourth Proportional to 1,296.81, 1,948.32 and 749.45

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Solution

The fourth proportional to 1,296.81, 1,948.32 and 749.45 is: 1,125.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.81 : 1,948.32 = 749.45 : x
  2. Step 2: Convert to fraction form
    1,296.81/1,948.32 = 749.45/x
  3. Step 3: Cross multiply
    1,296.81x = 1,948.32 × 749.45
  4. Step 4: Simplify right side
    1,296.81x = 1,460,173.29
  5. Step 5: Solve for x
    x = 1,460,173.29/1,296.81
  6. Step 6: Final answer
    x = 1,125.97

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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.