Home / 1,238.38-1,856.68-621.56

Finding the Fourth Proportional to 1,238.38, 1,856.68 and 621.56

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Solution

The fourth proportional to 1,238.38, 1,856.68 and 621.56 is: 931.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.38 : 1,856.68 = 621.56 : x
  2. Step 2: Convert to fraction form
    1,238.38/1,856.68 = 621.56/x
  3. Step 3: Cross multiply
    1,238.38x = 1,856.68 × 621.56
  4. Step 4: Simplify right side
    1,238.38x = 1,154,038.02
  5. Step 5: Solve for x
    x = 1,154,038.02/1,238.38
  6. Step 6: Final answer
    x = 931.89

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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.