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Finding the Fourth Proportional to 745.04, 1,030.20 and 636.32

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Solution

The fourth proportional to 745.04, 1,030.20 and 636.32 is: 879.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.04 : 1,030.20 = 636.32 : x
  2. Step 2: Convert to fraction form
    745.04/1,030.20 = 636.32/x
  3. Step 3: Cross multiply
    745.04x = 1,030.20 × 636.32
  4. Step 4: Simplify right side
    745.04x = 655,536.86
  5. Step 5: Solve for x
    x = 655,536.86/745.04
  6. Step 6: Final answer
    x = 879.87

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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.