Home / 20,390.22-28,147.14-12,435.30

Finding the Fourth Proportional to 20,390.22, 28,147.14 and 12,435.30

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Solution

The fourth proportional to 20,390.22, 28,147.14 and 12,435.30 is: 17,165.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.22 : 28,147.14 = 12,435.30 : x
  2. Step 2: Convert to fraction form
    20,390.22/28,147.14 = 12,435.30/x
  3. Step 3: Cross multiply
    20,390.22x = 28,147.14 × 12,435.30
  4. Step 4: Simplify right side
    20,390.22x = 350,018,130.04
  5. Step 5: Solve for x
    x = 350,018,130.04/20,390.22
  6. Step 6: Final answer
    x = 17,165.98

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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.