Home / 12,215.78-18,323.70-2,981.78

Finding the Fourth Proportional to 12,215.78, 18,323.70 and 2,981.78

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Solution

The fourth proportional to 12,215.78, 18,323.70 and 2,981.78 is: 4,472.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,215.78 : 18,323.70 = 2,981.78 : x
  2. Step 2: Convert to fraction form
    12,215.78/18,323.70 = 2,981.78/x
  3. Step 3: Cross multiply
    12,215.78x = 18,323.70 × 2,981.78
  4. Step 4: Simplify right side
    12,215.78x = 54,637,242.19
  5. Step 5: Solve for x
    x = 54,637,242.19/12,215.78
  6. Step 6: Final answer
    x = 4,472.68

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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.