Home / 28,355.72-39,130.26-15,781.64

Finding the Fourth Proportional to 28,355.72, 39,130.26 and 15,781.64

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Solution

The fourth proportional to 28,355.72, 39,130.26 and 15,781.64 is: 21,778.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.72 : 39,130.26 = 15,781.64 : x
  2. Step 2: Convert to fraction form
    28,355.72/39,130.26 = 15,781.64/x
  3. Step 3: Cross multiply
    28,355.72x = 39,130.26 × 15,781.64
  4. Step 4: Simplify right side
    28,355.72x = 617,539,676.43
  5. Step 5: Solve for x
    x = 617,539,676.43/28,355.72
  6. Step 6: Final answer
    x = 21,778.31

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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.