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Finding the Fourth Proportional to 903.78, 1,246.86 and 553.86

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Solution

The fourth proportional to 903.78, 1,246.86 and 553.86 is: 764.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.78 : 1,246.86 = 553.86 : x
  2. Step 2: Convert to fraction form
    903.78/1,246.86 = 553.86/x
  3. Step 3: Cross multiply
    903.78x = 1,246.86 × 553.86
  4. Step 4: Simplify right side
    903.78x = 690,585.88
  5. Step 5: Solve for x
    x = 690,585.88/903.78
  6. Step 6: Final answer
    x = 764.11

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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.