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Finding the Fourth Proportional to 743.40, 1,112.22 and 487.40

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Solution

The fourth proportional to 743.40, 1,112.22 and 487.40 is: 729.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.40 : 1,112.22 = 487.40 : x
  2. Step 2: Convert to fraction form
    743.40/1,112.22 = 487.40/x
  3. Step 3: Cross multiply
    743.40x = 1,112.22 × 487.40
  4. Step 4: Simplify right side
    743.40x = 542,096.03
  5. Step 5: Solve for x
    x = 542,096.03/743.40
  6. Step 6: Final answer
    x = 729.21

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1.5x scale

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.