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Finding the Fourth Proportional to 1,288.74, 1,933.20 and 558.12

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Solution

The fourth proportional to 1,288.74, 1,933.20 and 558.12 is: 837.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.74 : 1,933.20 = 558.12 : x
  2. Step 2: Convert to fraction form
    1,288.74/1,933.20 = 558.12/x
  3. Step 3: Cross multiply
    1,288.74x = 1,933.20 × 558.12
  4. Step 4: Simplify right side
    1,288.74x = 1,078,957.58
  5. Step 5: Solve for x
    x = 1,078,957.58/1,288.74
  6. Step 6: Final answer
    x = 837.22

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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.