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Finding the Fourth Proportional to 1,686.61, 2,327.65 and 978.65

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Solution

The fourth proportional to 1,686.61, 2,327.65 and 978.65 is: 1,350.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.61 : 2,327.65 = 978.65 : x
  2. Step 2: Convert to fraction form
    1,686.61/2,327.65 = 978.65/x
  3. Step 3: Cross multiply
    1,686.61x = 2,327.65 × 978.65
  4. Step 4: Simplify right side
    1,686.61x = 2,277,954.67
  5. Step 5: Solve for x
    x = 2,277,954.67/1,686.61
  6. Step 6: Final answer
    x = 1,350.61

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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.