Home / 20,987.63-28,954.25-12,488.06

Finding the Fourth Proportional to 20,987.63, 28,954.25 and 12,488.06

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Solution

The fourth proportional to 20,987.63, 28,954.25 and 12,488.06 is: 17,228.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.63 : 28,954.25 = 12,488.06 : x
  2. Step 2: Convert to fraction form
    20,987.63/28,954.25 = 12,488.06/x
  3. Step 3: Cross multiply
    20,987.63x = 28,954.25 × 12,488.06
  4. Step 4: Simplify right side
    20,987.63x = 361,582,411.26
  5. Step 5: Solve for x
    x = 361,582,411.26/20,987.63
  6. Step 6: Final answer
    x = 17,228.36

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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.