Home / 18,985.20-28,336.62-18,518.64

Finding the Fourth Proportional to 18,985.20, 28,336.62 and 18,518.64

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Solution

The fourth proportional to 18,985.20, 28,336.62 and 18,518.64 is: 27,640.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.20 : 28,336.62 = 18,518.64 : x
  2. Step 2: Convert to fraction form
    18,985.20/28,336.62 = 18,518.64/x
  3. Step 3: Cross multiply
    18,985.20x = 28,336.62 × 18,518.64
  4. Step 4: Simplify right side
    18,985.20x = 524,755,664.60
  5. Step 5: Solve for x
    x = 524,755,664.60/18,985.20
  6. Step 6: Final answer
    x = 27,640.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.