Home / 20,386.04-28,120.79-12,820.37

Finding the Fourth Proportional to 20,386.04, 28,120.79 and 12,820.37

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Solution

The fourth proportional to 20,386.04, 28,120.79 and 12,820.37 is: 17,684.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.04 : 28,120.79 = 12,820.37 : x
  2. Step 2: Convert to fraction form
    20,386.04/28,120.79 = 12,820.37/x
  3. Step 3: Cross multiply
    20,386.04x = 28,120.79 × 12,820.37
  4. Step 4: Simplify right side
    20,386.04x = 360,518,900.44
  5. Step 5: Solve for x
    x = 360,518,900.44/20,386.04
  6. Step 6: Final answer
    x = 17,684.60

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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.