Home / 20,357.57-28,099.02-12,399.72

Finding the Fourth Proportional to 20,357.57, 28,099.02 and 12,399.72

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Solution

The fourth proportional to 20,357.57, 28,099.02 and 12,399.72 is: 17,115.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,357.57 : 28,099.02 = 12,399.72 : x
  2. Step 2: Convert to fraction form
    20,357.57/28,099.02 = 12,399.72/x
  3. Step 3: Cross multiply
    20,357.57x = 28,099.02 × 12,399.72
  4. Step 4: Simplify right side
    20,357.57x = 348,419,980.27
  5. Step 5: Solve for x
    x = 348,419,980.27/20,357.57
  6. Step 6: Final answer
    x = 17,115.01

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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.