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Finding the Fourth Proportional to 933.66, 1,287.81 and 638.46

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Solution

The fourth proportional to 933.66, 1,287.81 and 638.46 is: 880.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.66 : 1,287.81 = 638.46 : x
  2. Step 2: Convert to fraction form
    933.66/1,287.81 = 638.46/x
  3. Step 3: Cross multiply
    933.66x = 1,287.81 × 638.46
  4. Step 4: Simplify right side
    933.66x = 822,215.17
  5. Step 5: Solve for x
    x = 822,215.17/933.66
  6. Step 6: Final answer
    x = 880.64

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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.