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Finding the Fourth Proportional to 933.53, 1,287.63 and 638.82

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Solution

The fourth proportional to 933.53, 1,287.63 and 638.82 is: 881.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.53 : 1,287.63 = 638.82 : x
  2. Step 2: Convert to fraction form
    933.53/1,287.63 = 638.82/x
  3. Step 3: Cross multiply
    933.53x = 1,287.63 × 638.82
  4. Step 4: Simplify right side
    933.53x = 822,563.80
  5. Step 5: Solve for x
    x = 822,563.80/933.53
  6. Step 6: Final answer
    x = 881.14

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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.