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Finding the Fourth Proportional to 920.86, 1,270.75 and 501.20

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Solution

The fourth proportional to 920.86, 1,270.75 and 501.20 is: 691.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.86 : 1,270.75 = 501.20 : x
  2. Step 2: Convert to fraction form
    920.86/1,270.75 = 501.20/x
  3. Step 3: Cross multiply
    920.86x = 1,270.75 × 501.20
  4. Step 4: Simplify right side
    920.86x = 636,900.49
  5. Step 5: Solve for x
    x = 636,900.49/920.86
  6. Step 6: Final answer
    x = 691.64

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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.