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Finding the Fourth Proportional to 155,622.70, 214,756.50 and 87,639.40

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Solution

The fourth proportional to 155,622.70, 214,756.50 and 87,639.40 is: 120,940.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,622.70 : 214,756.50 = 87,639.40 : x
  2. Step 2: Convert to fraction form
    155,622.70/214,756.50 = 87,639.40/x
  3. Step 3: Cross multiply
    155,622.70x = 214,756.50 × 87,639.40
  4. Step 4: Simplify right side
    155,622.70x = 18,821,130,806.10
  5. Step 5: Solve for x
    x = 18,821,130,806.10/155,622.70
  6. Step 6: Final answer
    x = 120,940.78

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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.