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Finding the Fourth Proportional to 933.32, 1,287.67 and 667.80

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Solution

The fourth proportional to 933.32, 1,287.67 and 667.80 is: 921.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.32 : 1,287.67 = 667.80 : x
  2. Step 2: Convert to fraction form
    933.32/1,287.67 = 667.80/x
  3. Step 3: Cross multiply
    933.32x = 1,287.67 × 667.80
  4. Step 4: Simplify right side
    933.32x = 859,906.03
  5. Step 5: Solve for x
    x = 859,906.03/933.32
  6. Step 6: Final answer
    x = 921.34

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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.