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Finding the Fourth Proportional to 862.64, 1,294.74 and 553.56

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Solution

The fourth proportional to 862.64, 1,294.74 and 553.56 is: 830.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.64 : 1,294.74 = 553.56 : x
  2. Step 2: Convert to fraction form
    862.64/1,294.74 = 553.56/x
  3. Step 3: Cross multiply
    862.64x = 1,294.74 × 553.56
  4. Step 4: Simplify right side
    862.64x = 716,716.27
  5. Step 5: Solve for x
    x = 716,716.27/862.64
  6. Step 6: Final answer
    x = 830.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.