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Finding the Fourth Proportional to 1,490.78, 2,236.42 and 553.78

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Solution

The fourth proportional to 1,490.78, 2,236.42 and 553.78 is: 830.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.78 : 2,236.42 = 553.78 : x
  2. Step 2: Convert to fraction form
    1,490.78/2,236.42 = 553.78/x
  3. Step 3: Cross multiply
    1,490.78x = 2,236.42 × 553.78
  4. Step 4: Simplify right side
    1,490.78x = 1,238,484.67
  5. Step 5: Solve for x
    x = 1,238,484.67/1,490.78
  6. Step 6: Final answer
    x = 830.76

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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.