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Finding the Fourth Proportional to 1,330.47, 1,994.49 and 919.80

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Solution

The fourth proportional to 1,330.47, 1,994.49 and 919.80 is: 1,378.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.47 : 1,994.49 = 919.80 : x
  2. Step 2: Convert to fraction form
    1,330.47/1,994.49 = 919.80/x
  3. Step 3: Cross multiply
    1,330.47x = 1,994.49 × 919.80
  4. Step 4: Simplify right side
    1,330.47x = 1,834,531.90
  5. Step 5: Solve for x
    x = 1,834,531.90/1,330.47
  6. Step 6: Final answer
    x = 1,378.86

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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.