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Finding the Fourth Proportional to 909.68, 1,253.28 and 734.72

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Solution

The fourth proportional to 909.68, 1,253.28 and 734.72 is: 1,012.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.68 : 1,253.28 = 734.72 : x
  2. Step 2: Convert to fraction form
    909.68/1,253.28 = 734.72/x
  3. Step 3: Cross multiply
    909.68x = 1,253.28 × 734.72
  4. Step 4: Simplify right side
    909.68x = 920,809.88
  5. Step 5: Solve for x
    x = 920,809.88/909.68
  6. Step 6: Final answer
    x = 1,012.23

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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.