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Finding the Fourth Proportional to 2,920.34, 4,381.19 and 840.29

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Solution

The fourth proportional to 2,920.34, 4,381.19 and 840.29 is: 1,260.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.34 : 4,381.19 = 840.29 : x
  2. Step 2: Convert to fraction form
    2,920.34/4,381.19 = 840.29/x
  3. Step 3: Cross multiply
    2,920.34x = 4,381.19 × 840.29
  4. Step 4: Simplify right side
    2,920.34x = 3,681,444.04
  5. Step 5: Solve for x
    x = 3,681,444.04/2,920.34
  6. Step 6: Final answer
    x = 1,260.62

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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.