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Finding the Fourth Proportional to 1,686.40, 2,327.17 and 978.26

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Solution

The fourth proportional to 1,686.40, 2,327.17 and 978.26 is: 1,349.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.40 : 2,327.17 = 978.26 : x
  2. Step 2: Convert to fraction form
    1,686.40/2,327.17 = 978.26/x
  3. Step 3: Cross multiply
    1,686.40x = 2,327.17 × 978.26
  4. Step 4: Simplify right side
    1,686.40x = 2,276,563.24
  5. Step 5: Solve for x
    x = 2,276,563.24/1,686.40
  6. Step 6: Final answer
    x = 1,349.96

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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.