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Finding the Fourth Proportional to 1,321.72, 1,824.12 and 923.13

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Solution

The fourth proportional to 1,321.72, 1,824.12 and 923.13 is: 1,274.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.72 : 1,824.12 = 923.13 : x
  2. Step 2: Convert to fraction form
    1,321.72/1,824.12 = 923.13/x
  3. Step 3: Cross multiply
    1,321.72x = 1,824.12 × 923.13
  4. Step 4: Simplify right side
    1,321.72x = 1,683,899.90
  5. Step 5: Solve for x
    x = 1,683,899.90/1,321.72
  6. Step 6: Final answer
    x = 1,274.02

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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.