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Finding the Fourth Proportional to 816.71, 1,224.81 and 508.70

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Solution

The fourth proportional to 816.71, 1,224.81 and 508.70 is: 762.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.71 : 1,224.81 = 508.70 : x
  2. Step 2: Convert to fraction form
    816.71/1,224.81 = 508.70/x
  3. Step 3: Cross multiply
    816.71x = 1,224.81 × 508.70
  4. Step 4: Simplify right side
    816.71x = 623,054.72
  5. Step 5: Solve for x
    x = 623,054.72/816.71
  6. Step 6: Final answer
    x = 762.89

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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.