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Finding the Fourth Proportional to 925.84, 1,276.32 and 663.40

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Solution

The fourth proportional to 925.84, 1,276.32 and 663.40 is: 914.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.84 : 1,276.32 = 663.40 : x
  2. Step 2: Convert to fraction form
    925.84/1,276.32 = 663.40/x
  3. Step 3: Cross multiply
    925.84x = 1,276.32 × 663.40
  4. Step 4: Simplify right side
    925.84x = 846,710.69
  5. Step 5: Solve for x
    x = 846,710.69/925.84
  6. Step 6: Final answer
    x = 914.53

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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.