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Finding the Fourth Proportional to 1,708.71, 2,563.20 and 978.90

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Solution

The fourth proportional to 1,708.71, 2,563.20 and 978.90 is: 1,468.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,708.71 : 2,563.20 = 978.90 : x
  2. Step 2: Convert to fraction form
    1,708.71/2,563.20 = 978.90/x
  3. Step 3: Cross multiply
    1,708.71x = 2,563.20 × 978.90
  4. Step 4: Simplify right side
    1,708.71x = 2,509,116.48
  5. Step 5: Solve for x
    x = 2,509,116.48/1,708.71
  6. Step 6: Final answer
    x = 1,468.43

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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.