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Finding the Fourth Proportional to 1,686.93, 2,328.09 and 978.96

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Solution

The fourth proportional to 1,686.93, 2,328.09 and 978.96 is: 1,351.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.93 : 2,328.09 = 978.96 : x
  2. Step 2: Convert to fraction form
    1,686.93/2,328.09 = 978.96/x
  3. Step 3: Cross multiply
    1,686.93x = 2,328.09 × 978.96
  4. Step 4: Simplify right side
    1,686.93x = 2,279,106.99
  5. Step 5: Solve for x
    x = 2,279,106.99/1,686.93
  6. Step 6: Final answer
    x = 1,351.04

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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.