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Finding the Fourth Proportional to 812.19, 1,218.75 and 349.95

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Solution

The fourth proportional to 812.19, 1,218.75 and 349.95 is: 525.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.19 : 1,218.75 = 349.95 : x
  2. Step 2: Convert to fraction form
    812.19/1,218.75 = 349.95/x
  3. Step 3: Cross multiply
    812.19x = 1,218.75 × 349.95
  4. Step 4: Simplify right side
    812.19x = 426,501.56
  5. Step 5: Solve for x
    x = 426,501.56/812.19
  6. Step 6: Final answer
    x = 525.13

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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.