Home / 17,981.76-26,928.90-12,420.30

Finding the Fourth Proportional to 17,981.76, 26,928.90 and 12,420.30

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Solution

The fourth proportional to 17,981.76, 26,928.90 and 12,420.30 is: 18,600.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,981.76 : 26,928.90 = 12,420.30 : x
  2. Step 2: Convert to fraction form
    17,981.76/26,928.90 = 12,420.30/x
  3. Step 3: Cross multiply
    17,981.76x = 26,928.90 × 12,420.30
  4. Step 4: Simplify right side
    17,981.76x = 334,465,016.67
  5. Step 5: Solve for x
    x = 334,465,016.67/17,981.76
  6. Step 6: Final answer
    x = 18,600.24

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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.