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Finding the Fourth Proportional to 925.60, 1,278.40 and 664

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Solution

The fourth proportional to 925.60, 1,278.40 and 664 is: 917.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.60 : 1,278.40 = 664 : x
  2. Step 2: Convert to fraction form
    925.60/1,278.40 = 664/x
  3. Step 3: Cross multiply
    925.60x = 1,278.40 × 664
  4. Step 4: Simplify right side
    925.60x = 848,857.60
  5. Step 5: Solve for x
    x = 848,857.60/925.60
  6. Step 6: Final answer
    x = 917.09

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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.