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Finding the Fourth Proportional to 1,641.62, 2,265.08 and 978.32

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Solution

The fourth proportional to 1,641.62, 2,265.08 and 978.32 is: 1,349.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.62 : 2,265.08 = 978.32 : x
  2. Step 2: Convert to fraction form
    1,641.62/2,265.08 = 978.32/x
  3. Step 3: Cross multiply
    1,641.62x = 2,265.08 × 978.32
  4. Step 4: Simplify right side
    1,641.62x = 2,215,973.07
  5. Step 5: Solve for x
    x = 2,215,973.07/1,641.62
  6. Step 6: Final answer
    x = 1,349.87

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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.