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Finding the Fourth Proportional to 909.76, 1,255.65 and 578.58

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Solution

The fourth proportional to 909.76, 1,255.65 and 578.58 is: 798.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.76 : 1,255.65 = 578.58 : x
  2. Step 2: Convert to fraction form
    909.76/1,255.65 = 578.58/x
  3. Step 3: Cross multiply
    909.76x = 1,255.65 × 578.58
  4. Step 4: Simplify right side
    909.76x = 726,493.98
  5. Step 5: Solve for x
    x = 726,493.98/909.76
  6. Step 6: Final answer
    x = 798.56

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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.