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Finding the Fourth Proportional to 1,911.84, 2,868.60 and 938.88

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Solution

The fourth proportional to 1,911.84, 2,868.60 and 938.88 is: 1,408.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.84 : 2,868.60 = 938.88 : x
  2. Step 2: Convert to fraction form
    1,911.84/2,868.60 = 938.88/x
  3. Step 3: Cross multiply
    1,911.84x = 2,868.60 × 938.88
  4. Step 4: Simplify right side
    1,911.84x = 2,693,271.17
  5. Step 5: Solve for x
    x = 2,693,271.17/1,911.84
  6. Step 6: Final answer
    x = 1,408.73

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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.