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Finding the Fourth Proportional to 933.21, 1,288.17 and 639.99

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Solution

The fourth proportional to 933.21, 1,288.17 and 639.99 is: 883.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.21 : 1,288.17 = 639.99 : x
  2. Step 2: Convert to fraction form
    933.21/1,288.17 = 639.99/x
  3. Step 3: Cross multiply
    933.21x = 1,288.17 × 639.99
  4. Step 4: Simplify right side
    933.21x = 824,415.92
  5. Step 5: Solve for x
    x = 824,415.92/933.21
  6. Step 6: Final answer
    x = 883.42

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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.