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Finding the Fourth Proportional to 933.21, 1,288.07 and 638.57

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Solution

The fourth proportional to 933.21, 1,288.07 and 638.57 is: 881.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.21 : 1,288.07 = 638.57 : x
  2. Step 2: Convert to fraction form
    933.21/1,288.07 = 638.57/x
  3. Step 3: Cross multiply
    933.21x = 1,288.07 × 638.57
  4. Step 4: Simplify right side
    933.21x = 822,522.86
  5. Step 5: Solve for x
    x = 822,522.86/933.21
  6. Step 6: Final answer
    x = 881.39

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1.5x scale

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.