Home / 20,970.51-28,940.11-12,019.74

Finding the Fourth Proportional to 20,970.51, 28,940.11 and 12,019.74

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Solution

The fourth proportional to 20,970.51, 28,940.11 and 12,019.74 is: 16,587.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.51 : 28,940.11 = 12,019.74 : x
  2. Step 2: Convert to fraction form
    20,970.51/28,940.11 = 12,019.74/x
  3. Step 3: Cross multiply
    20,970.51x = 28,940.11 × 12,019.74
  4. Step 4: Simplify right side
    20,970.51x = 347,852,676.25
  5. Step 5: Solve for x
    x = 347,852,676.25/20,970.51
  6. Step 6: Final answer
    x = 16,587.70

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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.