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Finding the Fourth Proportional to 920.89, 1,270.78 and 501.22

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Solution

The fourth proportional to 920.89, 1,270.78 and 501.22 is: 691.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.89 : 1,270.78 = 501.22 : x
  2. Step 2: Convert to fraction form
    920.89/1,270.78 = 501.22/x
  3. Step 3: Cross multiply
    920.89x = 1,270.78 × 501.22
  4. Step 4: Simplify right side
    920.89x = 636,940.35
  5. Step 5: Solve for x
    x = 636,940.35/920.89
  6. Step 6: Final answer
    x = 691.66

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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.