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Finding the Fourth Proportional to 675.76, 938.80 and 669.76

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Solution

The fourth proportional to 675.76, 938.80 and 669.76 is: 930.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.76 : 938.80 = 669.76 : x
  2. Step 2: Convert to fraction form
    675.76/938.80 = 669.76/x
  3. Step 3: Cross multiply
    675.76x = 938.80 × 669.76
  4. Step 4: Simplify right side
    675.76x = 628,770.69
  5. Step 5: Solve for x
    x = 628,770.69/675.76
  6. Step 6: Final answer
    x = 930.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.