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Finding the Fourth Proportional to 828.25, 1,142.99 and 479.14

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Solution

The fourth proportional to 828.25, 1,142.99 and 479.14 is: 661.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.25 : 1,142.99 = 479.14 : x
  2. Step 2: Convert to fraction form
    828.25/1,142.99 = 479.14/x
  3. Step 3: Cross multiply
    828.25x = 1,142.99 × 479.14
  4. Step 4: Simplify right side
    828.25x = 547,649.83
  5. Step 5: Solve for x
    x = 547,649.83/828.25
  6. Step 6: Final answer
    x = 661.21

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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.