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Finding the Fourth Proportional to 743.22, 1,025.72 and 428.50

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Solution

The fourth proportional to 743.22, 1,025.72 and 428.50 is: 591.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.22 : 1,025.72 = 428.50 : x
  2. Step 2: Convert to fraction form
    743.22/1,025.72 = 428.50/x
  3. Step 3: Cross multiply
    743.22x = 1,025.72 × 428.50
  4. Step 4: Simplify right side
    743.22x = 439,521.02
  5. Step 5: Solve for x
    x = 439,521.02/743.22
  6. Step 6: Final answer
    x = 591.37

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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.