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Finding the Fourth Proportional to 638.99, 953.62 and 622.59

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Solution

The fourth proportional to 638.99, 953.62 and 622.59 is: 929.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.99 : 953.62 = 622.59 : x
  2. Step 2: Convert to fraction form
    638.99/953.62 = 622.59/x
  3. Step 3: Cross multiply
    638.99x = 953.62 × 622.59
  4. Step 4: Simplify right side
    638.99x = 593,709.14
  5. Step 5: Solve for x
    x = 593,709.14/638.99
  6. Step 6: Final answer
    x = 929.14

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.