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Finding the Fourth Proportional to 28,959.90, 39,929.67 and 19,993.20

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Solution

The fourth proportional to 28,959.90, 39,929.67 and 19,993.20 is: 27,566.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,959.90 : 39,929.67 = 19,993.20 : x
  2. Step 2: Convert to fraction form
    28,959.90/39,929.67 = 19,993.20/x
  3. Step 3: Cross multiply
    28,959.90x = 39,929.67 × 19,993.20
  4. Step 4: Simplify right side
    28,959.90x = 798,321,878.24
  5. Step 5: Solve for x
    x = 798,321,878.24/28,959.90
  6. Step 6: Final answer
    x = 27,566.46

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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.