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Finding the Fourth Proportional to 909.72, 1,254.78 and 611.10

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Solution

The fourth proportional to 909.72, 1,254.78 and 611.10 is: 842.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.72 : 1,254.78 = 611.10 : x
  2. Step 2: Convert to fraction form
    909.72/1,254.78 = 611.10/x
  3. Step 3: Cross multiply
    909.72x = 1,254.78 × 611.10
  4. Step 4: Simplify right side
    909.72x = 766,796.06
  5. Step 5: Solve for x
    x = 766,796.06/909.72
  6. Step 6: Final answer
    x = 842.89

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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.