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Finding the Fourth Proportional to 18,840.57, 28,260.84 and 4,989.57

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Solution

The fourth proportional to 18,840.57, 28,260.84 and 4,989.57 is: 7,484.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840.57 : 28,260.84 = 4,989.57 : x
  2. Step 2: Convert to fraction form
    18,840.57/28,260.84 = 4,989.57/x
  3. Step 3: Cross multiply
    18,840.57x = 28,260.84 × 4,989.57
  4. Step 4: Simplify right side
    18,840.57x = 141,009,439.44
  5. Step 5: Solve for x
    x = 141,009,439.44/18,840.57
  6. Step 6: Final answer
    x = 7,484.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.