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Finding the Fourth Proportional to 1,238.59, 1,856.80 and 621.43

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Solution

The fourth proportional to 1,238.59, 1,856.80 and 621.43 is: 931.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.59 : 1,856.80 = 621.43 : x
  2. Step 2: Convert to fraction form
    1,238.59/1,856.80 = 621.43/x
  3. Step 3: Cross multiply
    1,238.59x = 1,856.80 × 621.43
  4. Step 4: Simplify right side
    1,238.59x = 1,153,871.22
  5. Step 5: Solve for x
    x = 1,153,871.22/1,238.59
  6. Step 6: Final answer
    x = 931.60

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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.