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Finding the Fourth Proportional to 675.60, 935.40 and 662.80

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Solution

The fourth proportional to 675.60, 935.40 and 662.80 is: 917.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.60 : 935.40 = 662.80 : x
  2. Step 2: Convert to fraction form
    675.60/935.40 = 662.80/x
  3. Step 3: Cross multiply
    675.60x = 935.40 × 662.80
  4. Step 4: Simplify right side
    675.60x = 619,983.12
  5. Step 5: Solve for x
    x = 619,983.12/675.60
  6. Step 6: Final answer
    x = 917.68

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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.