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Finding the Fourth Proportional to 708.86, 978 and 577.64

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Solution

The fourth proportional to 708.86, 978 and 577.64 is: 796.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.86 : 978 = 577.64 : x
  2. Step 2: Convert to fraction form
    708.86/978 = 577.64/x
  3. Step 3: Cross multiply
    708.86x = 978 × 577.64
  4. Step 4: Simplify right side
    708.86x = 564,931.92
  5. Step 5: Solve for x
    x = 564,931.92/708.86
  6. Step 6: Final answer
    x = 796.96

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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.