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Finding the Fourth Proportional to 921.23, 1,378.77 and 756.70

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Solution

The fourth proportional to 921.23, 1,378.77 and 756.70 is: 1,132.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.23 : 1,378.77 = 756.70 : x
  2. Step 2: Convert to fraction form
    921.23/1,378.77 = 756.70/x
  3. Step 3: Cross multiply
    921.23x = 1,378.77 × 756.70
  4. Step 4: Simplify right side
    921.23x = 1,043,315.26
  5. Step 5: Solve for x
    x = 1,043,315.26/921.23
  6. Step 6: Final answer
    x = 1,132.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.