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Finding the Fourth Proportional to 933.14, 1,288.14 and 639.92

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Solution

The fourth proportional to 933.14, 1,288.14 and 639.92 is: 883.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.14 : 1,288.14 = 639.92 : x
  2. Step 2: Convert to fraction form
    933.14/1,288.14 = 639.92/x
  3. Step 3: Cross multiply
    933.14x = 1,288.14 × 639.92
  4. Step 4: Simplify right side
    933.14x = 824,306.55
  5. Step 5: Solve for x
    x = 824,306.55/933.14
  6. Step 6: Final answer
    x = 883.37

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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.