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Finding the Fourth Proportional to 909.36, 1,252.80 and 628.56

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Solution

The fourth proportional to 909.36, 1,252.80 and 628.56 is: 865.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.36 : 1,252.80 = 628.56 : x
  2. Step 2: Convert to fraction form
    909.36/1,252.80 = 628.56/x
  3. Step 3: Cross multiply
    909.36x = 1,252.80 × 628.56
  4. Step 4: Simplify right side
    909.36x = 787,459.97
  5. Step 5: Solve for x
    x = 787,459.97/909.36
  6. Step 6: Final answer
    x = 865.95

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1.5x scale

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.