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Finding the Fourth Proportional to 708.16, 978.60 and 683.88

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Solution

The fourth proportional to 708.16, 978.60 and 683.88 is: 945.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.16 : 978.60 = 683.88 : x
  2. Step 2: Convert to fraction form
    708.16/978.60 = 683.88/x
  3. Step 3: Cross multiply
    708.16x = 978.60 × 683.88
  4. Step 4: Simplify right side
    708.16x = 669,244.97
  5. Step 5: Solve for x
    x = 669,244.97/708.16
  6. Step 6: Final answer
    x = 945.05

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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.