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Finding the Fourth Proportional to 1,641.16, 2,265 and 978.02

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Solution

The fourth proportional to 1,641.16, 2,265 and 978.02 is: 1,349.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.16 : 2,265 = 978.02 : x
  2. Step 2: Convert to fraction form
    1,641.16/2,265 = 978.02/x
  3. Step 3: Cross multiply
    1,641.16x = 2,265 × 978.02
  4. Step 4: Simplify right side
    1,641.16x = 2,215,215.30
  5. Step 5: Solve for x
    x = 2,215,215.30/1,641.16
  6. Step 6: Final answer
    x = 1,349.79

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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.