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Finding the Fourth Proportional to 2,920.31, 4,380.48 and 840.35

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Solution

The fourth proportional to 2,920.31, 4,380.48 and 840.35 is: 1,260.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.31 : 4,380.48 = 840.35 : x
  2. Step 2: Convert to fraction form
    2,920.31/4,380.48 = 840.35/x
  3. Step 3: Cross multiply
    2,920.31x = 4,380.48 × 840.35
  4. Step 4: Simplify right side
    2,920.31x = 3,681,136.37
  5. Step 5: Solve for x
    x = 3,681,136.37/2,920.31
  6. Step 6: Final answer
    x = 1,260.53

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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.