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Finding the Fourth Proportional to 688.49, 948.48 and 578.60

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Solution

The fourth proportional to 688.49, 948.48 and 578.60 is: 797.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.49 : 948.48 = 578.60 : x
  2. Step 2: Convert to fraction form
    688.49/948.48 = 578.60/x
  3. Step 3: Cross multiply
    688.49x = 948.48 × 578.60
  4. Step 4: Simplify right side
    688.49x = 548,790.53
  5. Step 5: Solve for x
    x = 548,790.53/688.49
  6. Step 6: Final answer
    x = 797.09

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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.