Home / 20,900.72-28,856.51-12,951.38

Finding the Fourth Proportional to 20,900.72, 28,856.51 and 12,951.38

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Solution

The fourth proportional to 20,900.72, 28,856.51 and 12,951.38 is: 17,881.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.72 : 28,856.51 = 12,951.38 : x
  2. Step 2: Convert to fraction form
    20,900.72/28,856.51 = 12,951.38/x
  3. Step 3: Cross multiply
    20,900.72x = 28,856.51 × 12,951.38
  4. Step 4: Simplify right side
    20,900.72x = 373,731,417.44
  5. Step 5: Solve for x
    x = 373,731,417.44/20,900.72
  6. Step 6: Final answer
    x = 17,881.27

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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.