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Finding the Fourth Proportional to 688.60, 951.78 and 656.20

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Solution

The fourth proportional to 688.60, 951.78 and 656.20 is: 907.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.60 : 951.78 = 656.20 : x
  2. Step 2: Convert to fraction form
    688.60/951.78 = 656.20/x
  3. Step 3: Cross multiply
    688.60x = 951.78 × 656.20
  4. Step 4: Simplify right side
    688.60x = 624,558.04
  5. Step 5: Solve for x
    x = 624,558.04/688.60
  6. Step 6: Final answer
    x = 907.00

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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.