Home / 1,239.24-1,856.14-621.87

Finding the Fourth Proportional to 1,239.24, 1,856.14 and 621.87

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Solution

The fourth proportional to 1,239.24, 1,856.14 and 621.87 is: 931.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.24 : 1,856.14 = 621.87 : x
  2. Step 2: Convert to fraction form
    1,239.24/1,856.14 = 621.87/x
  3. Step 3: Cross multiply
    1,239.24x = 1,856.14 × 621.87
  4. Step 4: Simplify right side
    1,239.24x = 1,154,277.78
  5. Step 5: Solve for x
    x = 1,154,277.78/1,239.24
  6. Step 6: Final answer
    x = 931.44

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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.