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Finding the Fourth Proportional to 688.60, 966.20 and 688.60

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Solution

The fourth proportional to 688.60, 966.20 and 688.60 is: 966.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.60 : 966.20 = 688.60 : x
  2. Step 2: Convert to fraction form
    688.60/966.20 = 688.60/x
  3. Step 3: Cross multiply
    688.60x = 966.20 × 688.60
  4. Step 4: Simplify right side
    688.60x = 665,325.32
  5. Step 5: Solve for x
    x = 665,325.32/688.60
  6. Step 6: Final answer
    x = 966.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.