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Finding the Fourth Proportional to 1,686.58, 2,327.65 and 978.21

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Solution

The fourth proportional to 1,686.58, 2,327.65 and 978.21 is: 1,350.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.58 : 2,327.65 = 978.21 : x
  2. Step 2: Convert to fraction form
    1,686.58/2,327.65 = 978.21/x
  3. Step 3: Cross multiply
    1,686.58x = 2,327.65 × 978.21
  4. Step 4: Simplify right side
    1,686.58x = 2,276,933.56
  5. Step 5: Solve for x
    x = 2,276,933.56/1,686.58
  6. Step 6: Final answer
    x = 1,350.03

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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.