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Finding the Fourth Proportional to 1,709.86, 2,564.78 and 978.92

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Solution

The fourth proportional to 1,709.86, 2,564.78 and 978.92 is: 1,468.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,709.86 : 2,564.78 = 978.92 : x
  2. Step 2: Convert to fraction form
    1,709.86/2,564.78 = 978.92/x
  3. Step 3: Cross multiply
    1,709.86x = 2,564.78 × 978.92
  4. Step 4: Simplify right side
    1,709.86x = 2,510,714.44
  5. Step 5: Solve for x
    x = 2,510,714.44/1,709.86
  6. Step 6: Final answer
    x = 1,468.37

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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.