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Finding the Fourth Proportional to 1,641.25, 2,264.90 and 978.13

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Solution

The fourth proportional to 1,641.25, 2,264.90 and 978.13 is: 1,349.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.25 : 2,264.90 = 978.13 : x
  2. Step 2: Convert to fraction form
    1,641.25/2,264.90 = 978.13/x
  3. Step 3: Cross multiply
    1,641.25x = 2,264.90 × 978.13
  4. Step 4: Simplify right side
    1,641.25x = 2,215,366.64
  5. Step 5: Solve for x
    x = 2,215,366.64/1,641.25
  6. Step 6: Final answer
    x = 1,349.80

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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.