Home / 28,428.64-39,231.70-15,854.20

Finding the Fourth Proportional to 28,428.64, 39,231.70 and 15,854.20

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Solution

The fourth proportional to 28,428.64, 39,231.70 and 15,854.20 is: 21,878.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.64 : 39,231.70 = 15,854.20 : x
  2. Step 2: Convert to fraction form
    28,428.64/39,231.70 = 15,854.20/x
  3. Step 3: Cross multiply
    28,428.64x = 39,231.70 × 15,854.20
  4. Step 4: Simplify right side
    28,428.64x = 621,987,218.14
  5. Step 5: Solve for x
    x = 621,987,218.14/28,428.64
  6. Step 6: Final answer
    x = 21,878.89

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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.