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Finding the Fourth Proportional to 2,920.42, 4,381.26 and 840.26

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Solution

The fourth proportional to 2,920.42, 4,381.26 and 840.26 is: 1,260.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.42 : 4,381.26 = 840.26 : x
  2. Step 2: Convert to fraction form
    2,920.42/4,381.26 = 840.26/x
  3. Step 3: Cross multiply
    2,920.42x = 4,381.26 × 840.26
  4. Step 4: Simplify right side
    2,920.42x = 3,681,397.53
  5. Step 5: Solve for x
    x = 3,681,397.53/2,920.42
  6. Step 6: Final answer
    x = 1,260.57

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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.