Home / 28,355.03-39,131.48-15,780.05

Finding the Fourth Proportional to 28,355.03, 39,131.48 and 15,780.05

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Solution

The fourth proportional to 28,355.03, 39,131.48 and 15,780.05 is: 21,777.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.03 : 39,131.48 = 15,780.05 : x
  2. Step 2: Convert to fraction form
    28,355.03/39,131.48 = 15,780.05/x
  3. Step 3: Cross multiply
    28,355.03x = 39,131.48 × 15,780.05
  4. Step 4: Simplify right side
    28,355.03x = 617,496,710.97
  5. Step 5: Solve for x
    x = 617,496,710.97/28,355.03
  6. Step 6: Final answer
    x = 21,777.33

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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.