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Finding the Fourth Proportional to 663.32, 915.81 and 622.01

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Solution

The fourth proportional to 663.32, 915.81 and 622.01 is: 858.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.32 : 915.81 = 622.01 : x
  2. Step 2: Convert to fraction form
    663.32/915.81 = 622.01/x
  3. Step 3: Cross multiply
    663.32x = 915.81 × 622.01
  4. Step 4: Simplify right side
    663.32x = 569,642.98
  5. Step 5: Solve for x
    x = 569,642.98/663.32
  6. Step 6: Final answer
    x = 858.78

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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.