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Finding the Fourth Proportional to 933.87, 1,288.92 and 712.42

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Solution

The fourth proportional to 933.87, 1,288.92 and 712.42 is: 983.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.87 : 1,288.92 = 712.42 : x
  2. Step 2: Convert to fraction form
    933.87/1,288.92 = 712.42/x
  3. Step 3: Cross multiply
    933.87x = 1,288.92 × 712.42
  4. Step 4: Simplify right side
    933.87x = 918,252.39
  5. Step 5: Solve for x
    x = 918,252.39/933.87
  6. Step 6: Final answer
    x = 983.28

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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.