Home / 20,291.60-28,020.36-12,647.92

Finding the Fourth Proportional to 20,291.60, 28,020.36 and 12,647.92

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Solution

The fourth proportional to 20,291.60, 28,020.36 and 12,647.92 is: 17,465.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,291.60 : 28,020.36 = 12,647.92 : x
  2. Step 2: Convert to fraction form
    20,291.60/28,020.36 = 12,647.92/x
  3. Step 3: Cross multiply
    20,291.60x = 28,020.36 × 12,647.92
  4. Step 4: Simplify right side
    20,291.60x = 354,399,271.65
  5. Step 5: Solve for x
    x = 354,399,271.65/20,291.60
  6. Step 6: Final answer
    x = 17,465.32

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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.