Home / 427,920.05-641,981.39-139,730.28

Finding the Fourth Proportional to 427,920.05, 641,981.39 and 139,730.28

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Solution

The fourth proportional to 427,920.05, 641,981.39 and 139,730.28 is: 209,628.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,920.05 : 641,981.39 = 139,730.28 : x
  2. Step 2: Convert to fraction form
    427,920.05/641,981.39 = 139,730.28/x
  3. Step 3: Cross multiply
    427,920.05x = 641,981.39 × 139,730.28
  4. Step 4: Simplify right side
    427,920.05x = 89,704,238,680.84
  5. Step 5: Solve for x
    x = 89,704,238,680.84/427,920.05
  6. Step 6: Final answer
    x = 209,628.50

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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.