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Finding the Fourth Proportional to 933.42, 1,398.47 and 640.44

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Solution

The fourth proportional to 933.42, 1,398.47 and 640.44 is: 959.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.42 : 1,398.47 = 640.44 : x
  2. Step 2: Convert to fraction form
    933.42/1,398.47 = 640.44/x
  3. Step 3: Cross multiply
    933.42x = 1,398.47 × 640.44
  4. Step 4: Simplify right side
    933.42x = 895,632.92
  5. Step 5: Solve for x
    x = 895,632.92/933.42
  6. Step 6: Final answer
    x = 959.51

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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.