Home / 28,005.90-38,648.79-15,431.82

Finding the Fourth Proportional to 28,005.90, 38,648.79 and 15,431.82

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Solution

The fourth proportional to 28,005.90, 38,648.79 and 15,431.82 is: 21,296.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,005.90 : 38,648.79 = 15,431.82 : x
  2. Step 2: Convert to fraction form
    28,005.90/38,648.79 = 15,431.82/x
  3. Step 3: Cross multiply
    28,005.90x = 38,648.79 × 15,431.82
  4. Step 4: Simplify right side
    28,005.90x = 596,421,170.50
  5. Step 5: Solve for x
    x = 596,421,170.50/28,005.90
  6. Step 6: Final answer
    x = 21,296.27

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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.