Home / 20,390.06-28,140.28-12,436.94

Finding the Fourth Proportional to 20,390.06, 28,140.28 and 12,436.94

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Solution

The fourth proportional to 20,390.06, 28,140.28 and 12,436.94 is: 17,164.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.06 : 28,140.28 = 12,436.94 : x
  2. Step 2: Convert to fraction form
    20,390.06/28,140.28 = 12,436.94/x
  3. Step 3: Cross multiply
    20,390.06x = 28,140.28 × 12,436.94
  4. Step 4: Simplify right side
    20,390.06x = 349,978,973.94
  5. Step 5: Solve for x
    x = 349,978,973.94/20,390.06
  6. Step 6: Final answer
    x = 17,164.20

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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.