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Finding the Fourth Proportional to 14,143.20, 21,214.80 and 7,216.80

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Solution

The fourth proportional to 14,143.20, 21,214.80 and 7,216.80 is: 10,825.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,143.20 : 21,214.80 = 7,216.80 : x
  2. Step 2: Convert to fraction form
    14,143.20/21,214.80 = 7,216.80/x
  3. Step 3: Cross multiply
    14,143.20x = 21,214.80 × 7,216.80
  4. Step 4: Simplify right side
    14,143.20x = 153,102,968.64
  5. Step 5: Solve for x
    x = 153,102,968.64/14,143.20
  6. Step 6: Final answer
    x = 10,825.20

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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.