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Finding the Fourth Proportional to 922.40, 1,382.72 and 345.14

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Solution

The fourth proportional to 922.40, 1,382.72 and 345.14 is: 517.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.40 : 1,382.72 = 345.14 : x
  2. Step 2: Convert to fraction form
    922.40/1,382.72 = 345.14/x
  3. Step 3: Cross multiply
    922.40x = 1,382.72 × 345.14
  4. Step 4: Simplify right side
    922.40x = 477,231.98
  5. Step 5: Solve for x
    x = 477,231.98/922.40
  6. Step 6: Final answer
    x = 517.38

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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.