Home / 7,815.47-11,722.79-1,972.13

Finding the Fourth Proportional to 7,815.47, 11,722.79 and 1,972.13

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Solution

The fourth proportional to 7,815.47, 11,722.79 and 1,972.13 is: 2,958.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.47 : 11,722.79 = 1,972.13 : x
  2. Step 2: Convert to fraction form
    7,815.47/11,722.79 = 1,972.13/x
  3. Step 3: Cross multiply
    7,815.47x = 11,722.79 × 1,972.13
  4. Step 4: Simplify right side
    7,815.47x = 23,118,865.84
  5. Step 5: Solve for x
    x = 23,118,865.84/7,815.47
  6. Step 6: Final answer
    x = 2,958.09

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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.