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Finding the Fourth Proportional to 1,763.92, 2,433.99 and 978.13

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Solution

The fourth proportional to 1,763.92, 2,433.99 and 978.13 is: 1,349.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,763.92 : 2,433.99 = 978.13 : x
  2. Step 2: Convert to fraction form
    1,763.92/2,433.99 = 978.13/x
  3. Step 3: Cross multiply
    1,763.92x = 2,433.99 × 978.13
  4. Step 4: Simplify right side
    1,763.92x = 2,380,758.64
  5. Step 5: Solve for x
    x = 2,380,758.64/1,763.92
  6. Step 6: Final answer
    x = 1,349.70

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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.