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Finding the Fourth Proportional to 1,238.21, 1,856.30 and 457.71

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Solution

The fourth proportional to 1,238.21, 1,856.30 and 457.71 is: 686.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.21 : 1,856.30 = 457.71 : x
  2. Step 2: Convert to fraction form
    1,238.21/1,856.30 = 457.71/x
  3. Step 3: Cross multiply
    1,238.21x = 1,856.30 × 457.71
  4. Step 4: Simplify right side
    1,238.21x = 849,644.78
  5. Step 5: Solve for x
    x = 849,644.78/1,238.21
  6. Step 6: Final answer
    x = 686.19

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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.