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Finding the Fourth Proportional to 946.20, 1,304.40 and 665.56

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Solution

The fourth proportional to 946.20, 1,304.40 and 665.56 is: 917.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.20 : 1,304.40 = 665.56 : x
  2. Step 2: Convert to fraction form
    946.20/1,304.40 = 665.56/x
  3. Step 3: Cross multiply
    946.20x = 1,304.40 × 665.56
  4. Step 4: Simplify right side
    946.20x = 868,156.46
  5. Step 5: Solve for x
    x = 868,156.46/946.20
  6. Step 6: Final answer
    x = 917.52

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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.