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Finding the Fourth Proportional to 745.52, 1,025.56 and 640.72

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Solution

The fourth proportional to 745.52, 1,025.56 and 640.72 is: 881.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.52 : 1,025.56 = 640.72 : x
  2. Step 2: Convert to fraction form
    745.52/1,025.56 = 640.72/x
  3. Step 3: Cross multiply
    745.52x = 1,025.56 × 640.72
  4. Step 4: Simplify right side
    745.52x = 657,096.80
  5. Step 5: Solve for x
    x = 657,096.80/745.52
  6. Step 6: Final answer
    x = 881.39

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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.