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Finding the Fourth Proportional to 1,038.81, 1,558.12 and 380.67

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Solution

The fourth proportional to 1,038.81, 1,558.12 and 380.67 is: 570.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.81 : 1,558.12 = 380.67 : x
  2. Step 2: Convert to fraction form
    1,038.81/1,558.12 = 380.67/x
  3. Step 3: Cross multiply
    1,038.81x = 1,558.12 × 380.67
  4. Step 4: Simplify right side
    1,038.81x = 593,129.54
  5. Step 5: Solve for x
    x = 593,129.54/1,038.81
  6. Step 6: Final answer
    x = 570.97

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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.