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Finding the Fourth Proportional to 1,815.70, 2,722.45 and 718.80

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Solution

The fourth proportional to 1,815.70, 2,722.45 and 718.80 is: 1,077.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.70 : 2,722.45 = 718.80 : x
  2. Step 2: Convert to fraction form
    1,815.70/2,722.45 = 718.80/x
  3. Step 3: Cross multiply
    1,815.70x = 2,722.45 × 718.80
  4. Step 4: Simplify right side
    1,815.70x = 1,956,897.06
  5. Step 5: Solve for x
    x = 1,956,897.06/1,815.70
  6. Step 6: Final answer
    x = 1,077.76

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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.