Home / 20,970.78-28,939.62-12,587.28

Finding the Fourth Proportional to 20,970.78, 28,939.62 and 12,587.28

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Solution

The fourth proportional to 20,970.78, 28,939.62 and 12,587.28 is: 17,370.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.78 : 28,939.62 = 12,587.28 : x
  2. Step 2: Convert to fraction form
    20,970.78/28,939.62 = 12,587.28/x
  3. Step 3: Cross multiply
    20,970.78x = 28,939.62 × 12,587.28
  4. Step 4: Simplify right side
    20,970.78x = 364,271,100.03
  5. Step 5: Solve for x
    x = 364,271,100.03/20,970.78
  6. Step 6: Final answer
    x = 17,370.41

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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.