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Finding the Fourth Proportional to 688.24, 948.72 and 578.08

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Solution

The fourth proportional to 688.24, 948.72 and 578.08 is: 796.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.24 : 948.72 = 578.08 : x
  2. Step 2: Convert to fraction form
    688.24/948.72 = 578.08/x
  3. Step 3: Cross multiply
    688.24x = 948.72 × 578.08
  4. Step 4: Simplify right side
    688.24x = 548,436.06
  5. Step 5: Solve for x
    x = 548,436.06/688.24
  6. Step 6: Final answer
    x = 796.87

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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.