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Finding the Fourth Proportional to 1,931.87, 2,902.43 and 1,239.89

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Solution

The fourth proportional to 1,931.87, 2,902.43 and 1,239.89 is: 1,862.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,931.87 : 2,902.43 = 1,239.89 : x
  2. Step 2: Convert to fraction form
    1,931.87/2,902.43 = 1,239.89/x
  3. Step 3: Cross multiply
    1,931.87x = 2,902.43 × 1,239.89
  4. Step 4: Simplify right side
    1,931.87x = 3,598,693.93
  5. Step 5: Solve for x
    x = 3,598,693.93/1,931.87
  6. Step 6: Final answer
    x = 1,862.80

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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.