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Finding the Fourth Proportional to 18,959.13, 28,438.70 and 5,108.13

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Solution

The fourth proportional to 18,959.13, 28,438.70 and 5,108.13 is: 7,662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.13 : 28,438.70 = 5,108.13 : x
  2. Step 2: Convert to fraction form
    18,959.13/28,438.70 = 5,108.13/x
  3. Step 3: Cross multiply
    18,959.13x = 28,438.70 × 5,108.13
  4. Step 4: Simplify right side
    18,959.13x = 145,268,576.63
  5. Step 5: Solve for x
    x = 145,268,576.63/18,959.13
  6. Step 6: Final answer
    x = 7,662.20

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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.