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Finding the Fourth Proportional to 14,145.40, 21,218.10 and 12,417.40

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Solution

The fourth proportional to 14,145.40, 21,218.10 and 12,417.40 is: 18,626.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,145.40 : 21,218.10 = 12,417.40 : x
  2. Step 2: Convert to fraction form
    14,145.40/21,218.10 = 12,417.40/x
  3. Step 3: Cross multiply
    14,145.40x = 21,218.10 × 12,417.40
  4. Step 4: Simplify right side
    14,145.40x = 263,473,634.94
  5. Step 5: Solve for x
    x = 263,473,634.94/14,145.40
  6. Step 6: Final answer
    x = 18,626.10

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Similar ratio
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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.