Home / 28,290.85-39,018.84-18,220.12

Finding the Fourth Proportional to 28,290.85, 39,018.84 and 18,220.12

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Solution

The fourth proportional to 28,290.85, 39,018.84 and 18,220.12 is: 25,129.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,290.85 : 39,018.84 = 18,220.12 : x
  2. Step 2: Convert to fraction form
    28,290.85/39,018.84 = 18,220.12/x
  3. Step 3: Cross multiply
    28,290.85x = 39,018.84 × 18,220.12
  4. Step 4: Simplify right side
    28,290.85x = 710,927,947.06
  5. Step 5: Solve for x
    x = 710,927,947.06/28,290.85
  6. Step 6: Final answer
    x = 25,129.25

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Half scale
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Similar ratio
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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.