Home / 20,390.48-28,140-15,345.64

Finding the Fourth Proportional to 20,390.48, 28,140 and 15,345.64

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Solution

The fourth proportional to 20,390.48, 28,140 and 15,345.64 is: 21,177.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.48 : 28,140 = 15,345.64 : x
  2. Step 2: Convert to fraction form
    20,390.48/28,140 = 15,345.64/x
  3. Step 3: Cross multiply
    20,390.48x = 28,140 × 15,345.64
  4. Step 4: Simplify right side
    20,390.48x = 431,826,309.60
  5. Step 5: Solve for x
    x = 431,826,309.60/20,390.48
  6. Step 6: Final answer
    x = 21,177.84

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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.