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Finding the Fourth Proportional to 812.96, 1,219.65 and 292.94

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Solution

The fourth proportional to 812.96, 1,219.65 and 292.94 is: 439.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.96 : 1,219.65 = 292.94 : x
  2. Step 2: Convert to fraction form
    812.96/1,219.65 = 292.94/x
  3. Step 3: Cross multiply
    812.96x = 1,219.65 × 292.94
  4. Step 4: Simplify right side
    812.96x = 357,284.27
  5. Step 5: Solve for x
    x = 357,284.27/812.96
  6. Step 6: Final answer
    x = 439.49

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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.