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Finding the Fourth Proportional to 909.28, 1,254.78 and 495.28

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Solution

The fourth proportional to 909.28, 1,254.78 and 495.28 is: 683.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.28 : 1,254.78 = 495.28 : x
  2. Step 2: Convert to fraction form
    909.28/1,254.78 = 495.28/x
  3. Step 3: Cross multiply
    909.28x = 1,254.78 × 495.28
  4. Step 4: Simplify right side
    909.28x = 621,467.44
  5. Step 5: Solve for x
    x = 621,467.44/909.28
  6. Step 6: Final answer
    x = 683.47

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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.