Home / 21,219.93-31,786.16-12,428.19

Finding the Fourth Proportional to 21,219.93, 31,786.16 and 12,428.19

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Solution

The fourth proportional to 21,219.93, 31,786.16 and 12,428.19 is: 18,616.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,219.93 : 31,786.16 = 12,428.19 : x
  2. Step 2: Convert to fraction form
    21,219.93/31,786.16 = 12,428.19/x
  3. Step 3: Cross multiply
    21,219.93x = 31,786.16 × 12,428.19
  4. Step 4: Simplify right side
    21,219.93x = 395,044,373.71
  5. Step 5: Solve for x
    x = 395,044,373.71/21,219.93
  6. Step 6: Final answer
    x = 18,616.67

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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.