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Finding the Fourth Proportional to 1,608.17, 2,218.62 and 978.19

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Solution

The fourth proportional to 1,608.17, 2,218.62 and 978.19 is: 1,349.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.17 : 2,218.62 = 978.19 : x
  2. Step 2: Convert to fraction form
    1,608.17/2,218.62 = 978.19/x
  3. Step 3: Cross multiply
    1,608.17x = 2,218.62 × 978.19
  4. Step 4: Simplify right side
    1,608.17x = 2,170,242.50
  5. Step 5: Solve for x
    x = 2,170,242.50/1,608.17
  6. Step 6: Final answer
    x = 1,349.51

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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.