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Finding the Fourth Proportional to 816.77, 1,224.95 and 239.64

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Solution

The fourth proportional to 816.77, 1,224.95 and 239.64 is: 359.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.77 : 1,224.95 = 239.64 : x
  2. Step 2: Convert to fraction form
    816.77/1,224.95 = 239.64/x
  3. Step 3: Cross multiply
    816.77x = 1,224.95 × 239.64
  4. Step 4: Simplify right side
    816.77x = 293,545.82
  5. Step 5: Solve for x
    x = 293,545.82/816.77
  6. Step 6: Final answer
    x = 359.40

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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.