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Finding the Fourth Proportional to 828.49, 1,143.24 and 455.46

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Solution

The fourth proportional to 828.49, 1,143.24 and 455.46 is: 628.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.49 : 1,143.24 = 455.46 : x
  2. Step 2: Convert to fraction form
    828.49/1,143.24 = 455.46/x
  3. Step 3: Cross multiply
    828.49x = 1,143.24 × 455.46
  4. Step 4: Simplify right side
    828.49x = 520,697.81
  5. Step 5: Solve for x
    x = 520,697.81/828.49
  6. Step 6: Final answer
    x = 628.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.