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Finding the Fourth Proportional to 919.34, 1,270.20 and 724.33

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Solution

The fourth proportional to 919.34, 1,270.20 and 724.33 is: 1,000.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.34 : 1,270.20 = 724.33 : x
  2. Step 2: Convert to fraction form
    919.34/1,270.20 = 724.33/x
  3. Step 3: Cross multiply
    919.34x = 1,270.20 × 724.33
  4. Step 4: Simplify right side
    919.34x = 920,040.34
  5. Step 5: Solve for x
    x = 920,040.34/919.34
  6. Step 6: Final answer
    x = 1,000.76

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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.