Home / 28,353.78-39,129.48-15,778.80

Finding the Fourth Proportional to 28,353.78, 39,129.48 and 15,778.80

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Solution

The fourth proportional to 28,353.78, 39,129.48 and 15,778.80 is: 21,775.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,353.78 : 39,129.48 = 15,778.80 : x
  2. Step 2: Convert to fraction form
    28,353.78/39,129.48 = 15,778.80/x
  3. Step 3: Cross multiply
    28,353.78x = 39,129.48 × 15,778.80
  4. Step 4: Simplify right side
    28,353.78x = 617,416,239.02
  5. Step 5: Solve for x
    x = 617,416,239.02/28,353.78
  6. Step 6: Final answer
    x = 21,775.45

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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.