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Finding the Fourth Proportional to 1,921.33, 2,881.53 and 880.68

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Solution

The fourth proportional to 1,921.33, 2,881.53 and 880.68 is: 1,320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.33 : 2,881.53 = 880.68 : x
  2. Step 2: Convert to fraction form
    1,921.33/2,881.53 = 880.68/x
  3. Step 3: Cross multiply
    1,921.33x = 2,881.53 × 880.68
  4. Step 4: Simplify right side
    1,921.33x = 2,537,702.91
  5. Step 5: Solve for x
    x = 2,537,702.91/1,921.33
  6. Step 6: Final answer
    x = 1,320.81

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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.