Home / 28,353.30-39,128.85-15,778.86

Finding the Fourth Proportional to 28,353.30, 39,128.85 and 15,778.86

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Solution

The fourth proportional to 28,353.30, 39,128.85 and 15,778.86 is: 21,775.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,353.30 : 39,128.85 = 15,778.86 : x
  2. Step 2: Convert to fraction form
    28,353.30/39,128.85 = 15,778.86/x
  3. Step 3: Cross multiply
    28,353.30x = 39,128.85 × 15,778.86
  4. Step 4: Simplify right side
    28,353.30x = 617,408,646.11
  5. Step 5: Solve for x
    x = 617,408,646.11/28,353.30
  6. Step 6: Final answer
    x = 21,775.55

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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.