Home / 20,389.66-28,137.09-12,428.98

Finding the Fourth Proportional to 20,389.66, 28,137.09 and 12,428.98

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Solution

The fourth proportional to 20,389.66, 28,137.09 and 12,428.98 is: 17,151.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.66 : 28,137.09 = 12,428.98 : x
  2. Step 2: Convert to fraction form
    20,389.66/28,137.09 = 12,428.98/x
  3. Step 3: Cross multiply
    20,389.66x = 28,137.09 × 12,428.98
  4. Step 4: Simplify right side
    20,389.66x = 349,715,328.87
  5. Step 5: Solve for x
    x = 349,715,328.87/20,389.66
  6. Step 6: Final answer
    x = 17,151.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.