Home / 20,580.21-28,400.78-11,148.77

Finding the Fourth Proportional to 20,580.21, 28,400.78 and 11,148.77

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Solution

The fourth proportional to 20,580.21, 28,400.78 and 11,148.77 is: 15,385.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.21 : 28,400.78 = 11,148.77 : x
  2. Step 2: Convert to fraction form
    20,580.21/28,400.78 = 11,148.77/x
  3. Step 3: Cross multiply
    20,580.21x = 28,400.78 × 11,148.77
  4. Step 4: Simplify right side
    20,580.21x = 316,633,800.20
  5. Step 5: Solve for x
    x = 316,633,800.20/20,580.21
  6. Step 6: Final answer
    x = 15,385.35

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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.