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Finding the Fourth Proportional to 18,859.81, 28,289.72 and 5,008.81

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Solution

The fourth proportional to 18,859.81, 28,289.72 and 5,008.81 is: 7,513.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,859.81 : 28,289.72 = 5,008.81 : x
  2. Step 2: Convert to fraction form
    18,859.81/28,289.72 = 5,008.81/x
  3. Step 3: Cross multiply
    18,859.81x = 28,289.72 × 5,008.81
  4. Step 4: Simplify right side
    18,859.81x = 141,697,832.43
  5. Step 5: Solve for x
    x = 141,697,832.43/18,859.81
  6. Step 6: Final answer
    x = 7,513.22

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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.