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Finding the Fourth Proportional to 921.19, 1,381.96 and 336.22

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Solution

The fourth proportional to 921.19, 1,381.96 and 336.22 is: 504.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.19 : 1,381.96 = 336.22 : x
  2. Step 2: Convert to fraction form
    921.19/1,381.96 = 336.22/x
  3. Step 3: Cross multiply
    921.19x = 1,381.96 × 336.22
  4. Step 4: Simplify right side
    921.19x = 464,639.56
  5. Step 5: Solve for x
    x = 464,639.56/921.19
  6. Step 6: Final answer
    x = 504.39

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.