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Finding the Fourth Proportional to 933.56, 1,288.76 and 640.35

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Solution

The fourth proportional to 933.56, 1,288.76 and 640.35 is: 883.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.56 : 1,288.76 = 640.35 : x
  2. Step 2: Convert to fraction form
    933.56/1,288.76 = 640.35/x
  3. Step 3: Cross multiply
    933.56x = 1,288.76 × 640.35
  4. Step 4: Simplify right side
    933.56x = 825,254.26
  5. Step 5: Solve for x
    x = 825,254.26/933.56
  6. Step 6: Final answer
    x = 883.99

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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.