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Finding the Fourth Proportional to 71,210.60, 106,822 and 18,620

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Solution

The fourth proportional to 71,210.60, 106,822 and 18,620 is: 27,931.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,210.60 : 106,822 = 18,620 : x
  2. Step 2: Convert to fraction form
    71,210.60/106,822 = 18,620/x
  3. Step 3: Cross multiply
    71,210.60x = 106,822 × 18,620
  4. Step 4: Simplify right side
    71,210.60x = 1,989,025,640
  5. Step 5: Solve for x
    x = 1,989,025,640/71,210.60
  6. Step 6: Final answer
    x = 27,931.60

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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.