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Finding the Fourth Proportional to 663.10, 914.95 and 505.46

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Solution

The fourth proportional to 663.10, 914.95 and 505.46 is: 697.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.10 : 914.95 = 505.46 : x
  2. Step 2: Convert to fraction form
    663.10/914.95 = 505.46/x
  3. Step 3: Cross multiply
    663.10x = 914.95 × 505.46
  4. Step 4: Simplify right side
    663.10x = 462,465.56
  5. Step 5: Solve for x
    x = 462,465.56/663.10
  6. Step 6: Final answer
    x = 697.43

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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.