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Finding the Fourth Proportional to 743.37, 1,025.80 and 428.61

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Solution

The fourth proportional to 743.37, 1,025.80 and 428.61 is: 591.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.37 : 1,025.80 = 428.61 : x
  2. Step 2: Convert to fraction form
    743.37/1,025.80 = 428.61/x
  3. Step 3: Cross multiply
    743.37x = 1,025.80 × 428.61
  4. Step 4: Simplify right side
    743.37x = 439,668.14
  5. Step 5: Solve for x
    x = 439,668.14/743.37
  6. Step 6: Final answer
    x = 591.45

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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.