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Finding the Fourth Proportional to 909.72, 1,254.56 and 611.64

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Solution

The fourth proportional to 909.72, 1,254.56 and 611.64 is: 843.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.72 : 1,254.56 = 611.64 : x
  2. Step 2: Convert to fraction form
    909.72/1,254.56 = 611.64/x
  3. Step 3: Cross multiply
    909.72x = 1,254.56 × 611.64
  4. Step 4: Simplify right side
    909.72x = 767,336.02
  5. Step 5: Solve for x
    x = 767,336.02/909.72
  6. Step 6: Final answer
    x = 843.49

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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.