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Finding the Fourth Proportional to 708.68, 978.10 and 443.24

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Solution

The fourth proportional to 708.68, 978.10 and 443.24 is: 611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.68 : 978.10 = 443.24 : x
  2. Step 2: Convert to fraction form
    708.68/978.10 = 443.24/x
  3. Step 3: Cross multiply
    708.68x = 978.10 × 443.24
  4. Step 4: Simplify right side
    708.68x = 433,533.04
  5. Step 5: Solve for x
    x = 433,533.04/708.68
  6. Step 6: Final answer
    x = 611.75

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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.