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Finding the Fourth Proportional to 828.60, 1,143.46 and 455.60

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Solution

The fourth proportional to 828.60, 1,143.46 and 455.60 is: 628.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.60 : 1,143.46 = 455.60 : x
  2. Step 2: Convert to fraction form
    828.60/1,143.46 = 455.60/x
  3. Step 3: Cross multiply
    828.60x = 1,143.46 × 455.60
  4. Step 4: Simplify right side
    828.60x = 520,957.52
  5. Step 5: Solve for x
    x = 520,957.52/828.60
  6. Step 6: Final answer
    x = 628.72

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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.