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Finding the Fourth Proportional to 1,039.11, 1,558.15 and 345.54

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Solution

The fourth proportional to 1,039.11, 1,558.15 and 345.54 is: 518.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.11 : 1,558.15 = 345.54 : x
  2. Step 2: Convert to fraction form
    1,039.11/1,558.15 = 345.54/x
  3. Step 3: Cross multiply
    1,039.11x = 1,558.15 × 345.54
  4. Step 4: Simplify right side
    1,039.11x = 538,405.69
  5. Step 5: Solve for x
    x = 538,405.69/1,039.11
  6. Step 6: Final answer
    x = 518.14

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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.