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Finding the Fourth Proportional to 1,471.70, 2,029.20 and 1,219.70

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Solution

The fourth proportional to 1,471.70, 2,029.20 and 1,219.70 is: 1,681.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.70 : 2,029.20 = 1,219.70 : x
  2. Step 2: Convert to fraction form
    1,471.70/2,029.20 = 1,219.70/x
  3. Step 3: Cross multiply
    1,471.70x = 2,029.20 × 1,219.70
  4. Step 4: Simplify right side
    1,471.70x = 2,475,015.24
  5. Step 5: Solve for x
    x = 2,475,015.24/1,471.70
  6. Step 6: Final answer
    x = 1,681.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.