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Finding the Fourth Proportional to 667.56, 919.82 and 621.38

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Solution

The fourth proportional to 667.56, 919.82 and 621.38 is: 856.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.56 : 919.82 = 621.38 : x
  2. Step 2: Convert to fraction form
    667.56/919.82 = 621.38/x
  3. Step 3: Cross multiply
    667.56x = 919.82 × 621.38
  4. Step 4: Simplify right side
    667.56x = 571,557.75
  5. Step 5: Solve for x
    x = 571,557.75/667.56
  6. Step 6: Final answer
    x = 856.19

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Double scale
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1.5x scale

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.