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Finding the Fourth Proportional to 18,840.42, 28,260.81 and 4,989.42

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Solution

The fourth proportional to 18,840.42, 28,260.81 and 4,989.42 is: 7,484.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840.42 : 28,260.81 = 4,989.42 : x
  2. Step 2: Convert to fraction form
    18,840.42/28,260.81 = 4,989.42/x
  3. Step 3: Cross multiply
    18,840.42x = 28,260.81 × 4,989.42
  4. Step 4: Simplify right side
    18,840.42x = 141,005,050.63
  5. Step 5: Solve for x
    x = 141,005,050.63/18,840.42
  6. Step 6: Final answer
    x = 7,484.18

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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.