Home / 20,621.72-28,456.40-12,124.19

Finding the Fourth Proportional to 20,621.72, 28,456.40 and 12,124.19

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Solution

The fourth proportional to 20,621.72, 28,456.40 and 12,124.19 is: 16,730.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.72 : 28,456.40 = 12,124.19 : x
  2. Step 2: Convert to fraction form
    20,621.72/28,456.40 = 12,124.19/x
  3. Step 3: Cross multiply
    20,621.72x = 28,456.40 × 12,124.19
  4. Step 4: Simplify right side
    20,621.72x = 345,010,688.34
  5. Step 5: Solve for x
    x = 345,010,688.34/20,621.72
  6. Step 6: Final answer
    x = 16,730.46

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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.