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Finding the Fourth Proportional to 745.49, 1,118.30 and 422.93

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Solution

The fourth proportional to 745.49, 1,118.30 and 422.93 is: 634.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.49 : 1,118.30 = 422.93 : x
  2. Step 2: Convert to fraction form
    745.49/1,118.30 = 422.93/x
  3. Step 3: Cross multiply
    745.49x = 1,118.30 × 422.93
  4. Step 4: Simplify right side
    745.49x = 472,962.62
  5. Step 5: Solve for x
    x = 472,962.62/745.49
  6. Step 6: Final answer
    x = 634.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.