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Finding the Fourth Proportional to 25,959.40, 38,939.10 and 20,775.40

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Solution

The fourth proportional to 25,959.40, 38,939.10 and 20,775.40 is: 31,163.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,959.40 : 38,939.10 = 20,775.40 : x
  2. Step 2: Convert to fraction form
    25,959.40/38,939.10 = 20,775.40/x
  3. Step 3: Cross multiply
    25,959.40x = 38,939.10 × 20,775.40
  4. Step 4: Simplify right side
    25,959.40x = 808,975,378.14
  5. Step 5: Solve for x
    x = 808,975,378.14/25,959.40
  6. Step 6: Final answer
    x = 31,163.10

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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.