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Finding the Fourth Proportional to 933.30, 1,287.93 and 638.55

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Solution

The fourth proportional to 933.30, 1,287.93 and 638.55 is: 881.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.30 : 1,287.93 = 638.55 : x
  2. Step 2: Convert to fraction form
    933.30/1,287.93 = 638.55/x
  3. Step 3: Cross multiply
    933.30x = 1,287.93 × 638.55
  4. Step 4: Simplify right side
    933.30x = 822,407.70
  5. Step 5: Solve for x
    x = 822,407.70/933.30
  6. Step 6: Final answer
    x = 881.18

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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.