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Finding the Fourth Proportional to 920.17, 1,269.86 and 500.54

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Solution

The fourth proportional to 920.17, 1,269.86 and 500.54 is: 690.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.17 : 1,269.86 = 500.54 : x
  2. Step 2: Convert to fraction form
    920.17/1,269.86 = 500.54/x
  3. Step 3: Cross multiply
    920.17x = 1,269.86 × 500.54
  4. Step 4: Simplify right side
    920.17x = 635,612.55
  5. Step 5: Solve for x
    x = 635,612.55/920.17
  6. Step 6: Final answer
    x = 690.76

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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.