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Finding the Fourth Proportional to 1,239.23, 1,856.83 and 654.20

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Solution

The fourth proportional to 1,239.23, 1,856.83 and 654.20 is: 980.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.23 : 1,856.83 = 654.20 : x
  2. Step 2: Convert to fraction form
    1,239.23/1,856.83 = 654.20/x
  3. Step 3: Cross multiply
    1,239.23x = 1,856.83 × 654.20
  4. Step 4: Simplify right side
    1,239.23x = 1,214,727.27
  5. Step 5: Solve for x
    x = 1,214,727.27/1,239.23
  6. Step 6: Final answer
    x = 980.23

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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.