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Finding the Fourth Proportional to 14,143.60, 21,215.40 and 12,912.40

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Solution

The fourth proportional to 14,143.60, 21,215.40 and 12,912.40 is: 19,368.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,143.60 : 21,215.40 = 12,912.40 : x
  2. Step 2: Convert to fraction form
    14,143.60/21,215.40 = 12,912.40/x
  3. Step 3: Cross multiply
    14,143.60x = 21,215.40 × 12,912.40
  4. Step 4: Simplify right side
    14,143.60x = 273,941,730.96
  5. Step 5: Solve for x
    x = 273,941,730.96/14,143.60
  6. Step 6: Final answer
    x = 19,368.60

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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.