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Finding the Fourth Proportional to 827.62, 1,142.18 and 478.51

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Solution

The fourth proportional to 827.62, 1,142.18 and 478.51 is: 660.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.62 : 1,142.18 = 478.51 : x
  2. Step 2: Convert to fraction form
    827.62/1,142.18 = 478.51/x
  3. Step 3: Cross multiply
    827.62x = 1,142.18 × 478.51
  4. Step 4: Simplify right side
    827.62x = 546,542.16
  5. Step 5: Solve for x
    x = 546,542.16/827.62
  6. Step 6: Final answer
    x = 660.38

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Double scale
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1.5x scale

Why These Related Problems?

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