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Finding the Fourth Proportional to 1,718.86, 2,579.68 and 978.94

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Solution

The fourth proportional to 1,718.86, 2,579.68 and 978.94 is: 1,469.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.86 : 2,579.68 = 978.94 : x
  2. Step 2: Convert to fraction form
    1,718.86/2,579.68 = 978.94/x
  3. Step 3: Cross multiply
    1,718.86x = 2,579.68 × 978.94
  4. Step 4: Simplify right side
    1,718.86x = 2,525,351.94
  5. Step 5: Solve for x
    x = 2,525,351.94/1,718.86
  6. Step 6: Final answer
    x = 1,469.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.