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Finding the Fourth Proportional to 827.80, 1,142.48 and 478.52

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Solution

The fourth proportional to 827.80, 1,142.48 and 478.52 is: 660.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.80 : 1,142.48 = 478.52 : x
  2. Step 2: Convert to fraction form
    827.80/1,142.48 = 478.52/x
  3. Step 3: Cross multiply
    827.80x = 1,142.48 × 478.52
  4. Step 4: Simplify right side
    827.80x = 546,699.53
  5. Step 5: Solve for x
    x = 546,699.53/827.80
  6. Step 6: Final answer
    x = 660.42

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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.