Home / 20,390.72-28,138.98-12,432.44

Finding the Fourth Proportional to 20,390.72, 28,138.98 and 12,432.44

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Solution

The fourth proportional to 20,390.72, 28,138.98 and 12,432.44 is: 17,156.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.72 : 28,138.98 = 12,432.44 : x
  2. Step 2: Convert to fraction form
    20,390.72/28,138.98 = 12,432.44/x
  3. Step 3: Cross multiply
    20,390.72x = 28,138.98 × 12,432.44
  4. Step 4: Simplify right side
    20,390.72x = 349,836,180.51
  5. Step 5: Solve for x
    x = 349,836,180.51/20,390.72
  6. Step 6: Final answer
    x = 17,156.64

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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.