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Finding the Fourth Proportional to 819.59, 1,228.16 and 357.12

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Solution

The fourth proportional to 819.59, 1,228.16 and 357.12 is: 535.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.59 : 1,228.16 = 357.12 : x
  2. Step 2: Convert to fraction form
    819.59/1,228.16 = 357.12/x
  3. Step 3: Cross multiply
    819.59x = 1,228.16 × 357.12
  4. Step 4: Simplify right side
    819.59x = 438,603.12
  5. Step 5: Solve for x
    x = 438,603.12/819.59
  6. Step 6: Final answer
    x = 535.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.