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Finding the Fourth Proportional to 920.09, 1,377.74 and 508.74

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Solution

The fourth proportional to 920.09, 1,377.74 and 508.74 is: 761.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.09 : 1,377.74 = 508.74 : x
  2. Step 2: Convert to fraction form
    920.09/1,377.74 = 508.74/x
  3. Step 3: Cross multiply
    920.09x = 1,377.74 × 508.74
  4. Step 4: Simplify right side
    920.09x = 700,908.90
  5. Step 5: Solve for x
    x = 700,908.90/920.09
  6. Step 6: Final answer
    x = 761.79

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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.