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Finding the Fourth Proportional to 816, 1,126.17 and 505.50

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Solution

The fourth proportional to 816, 1,126.17 and 505.50 is: 697.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    816 : 1,126.17 = 505.50 : x
  2. Step 2: Convert to fraction form
    816/1,126.17 = 505.50/x
  3. Step 3: Cross multiply
    816x = 1,126.17 × 505.50
  4. Step 4: Simplify right side
    816x = 569,278.94
  5. Step 5: Solve for x
    x = 569,278.94/816
  6. Step 6: Final answer
    x = 697.65

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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.