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Finding the Fourth Proportional to 1,238.35, 1,856.43 and 621.17

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Solution

The fourth proportional to 1,238.35, 1,856.43 and 621.17 is: 931.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.35 : 1,856.43 = 621.17 : x
  2. Step 2: Convert to fraction form
    1,238.35/1,856.43 = 621.17/x
  3. Step 3: Cross multiply
    1,238.35x = 1,856.43 × 621.17
  4. Step 4: Simplify right side
    1,238.35x = 1,153,163.26
  5. Step 5: Solve for x
    x = 1,153,163.26/1,238.35
  6. Step 6: Final answer
    x = 931.21

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1.5x scale

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.