Home / 28,360.89-39,138.02-15,788.61

Finding the Fourth Proportional to 28,360.89, 39,138.02 and 15,788.61

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Solution

The fourth proportional to 28,360.89, 39,138.02 and 15,788.61 is: 21,788.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,360.89 : 39,138.02 = 15,788.61 : x
  2. Step 2: Convert to fraction form
    28,360.89/39,138.02 = 15,788.61/x
  3. Step 3: Cross multiply
    28,360.89x = 39,138.02 × 15,788.61
  4. Step 4: Simplify right side
    28,360.89x = 617,934,855.01
  5. Step 5: Solve for x
    x = 617,934,855.01/28,360.89
  6. Step 6: Final answer
    x = 21,788.27

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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.