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Finding the Fourth Proportional to 8,145.80, 12,218.70 and 5,215.40

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Solution

The fourth proportional to 8,145.80, 12,218.70 and 5,215.40 is: 7,823.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,145.80 : 12,218.70 = 5,215.40 : x
  2. Step 2: Convert to fraction form
    8,145.80/12,218.70 = 5,215.40/x
  3. Step 3: Cross multiply
    8,145.80x = 12,218.70 × 5,215.40
  4. Step 4: Simplify right side
    8,145.80x = 63,725,407.98
  5. Step 5: Solve for x
    x = 63,725,407.98/8,145.80
  6. Step 6: Final answer
    x = 7,823.10

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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.