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Finding the Fourth Proportional to 744.63, 1,025.46 and 638.88

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Solution

The fourth proportional to 744.63, 1,025.46 and 638.88 is: 879.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.63 : 1,025.46 = 638.88 : x
  2. Step 2: Convert to fraction form
    744.63/1,025.46 = 638.88/x
  3. Step 3: Cross multiply
    744.63x = 1,025.46 × 638.88
  4. Step 4: Simplify right side
    744.63x = 655,145.88
  5. Step 5: Solve for x
    x = 655,145.88/744.63
  6. Step 6: Final answer
    x = 879.83

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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.