Home / 25,691.78-35,429.40-20,639.81

Finding the Fourth Proportional to 25,691.78, 35,429.40 and 20,639.81

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Solution

The fourth proportional to 25,691.78, 35,429.40 and 20,639.81 is: 28,462.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,691.78 : 35,429.40 = 20,639.81 : x
  2. Step 2: Convert to fraction form
    25,691.78/35,429.40 = 20,639.81/x
  3. Step 3: Cross multiply
    25,691.78x = 35,429.40 × 20,639.81
  4. Step 4: Simplify right side
    25,691.78x = 731,256,172.99
  5. Step 5: Solve for x
    x = 731,256,172.99/25,691.78
  6. Step 6: Final answer
    x = 28,462.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.