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Finding the Fourth Proportional to 18,679.71, 28,014.10 and 15,384.63

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Solution

The fourth proportional to 18,679.71, 28,014.10 and 15,384.63 is: 23,072.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.71 : 28,014.10 = 15,384.63 : x
  2. Step 2: Convert to fraction form
    18,679.71/28,014.10 = 15,384.63/x
  3. Step 3: Cross multiply
    18,679.71x = 28,014.10 × 15,384.63
  4. Step 4: Simplify right side
    18,679.71x = 430,986,716.41
  5. Step 5: Solve for x
    x = 430,986,716.41/18,679.71
  6. Step 6: Final answer
    x = 23,072.45

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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.