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Finding the Fourth Proportional to 708.55, 977.84 and 409.85

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Solution

The fourth proportional to 708.55, 977.84 and 409.85 is: 565.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.55 : 977.84 = 409.85 : x
  2. Step 2: Convert to fraction form
    708.55/977.84 = 409.85/x
  3. Step 3: Cross multiply
    708.55x = 977.84 × 409.85
  4. Step 4: Simplify right side
    708.55x = 400,767.72
  5. Step 5: Solve for x
    x = 400,767.72/708.55
  6. Step 6: Final answer
    x = 565.62

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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.