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Finding the Fourth Proportional to 8,148.40, 12,246.90 and 7,079.20

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Solution

The fourth proportional to 8,148.40, 12,246.90 and 7,079.20 is: 10,639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,148.40 : 12,246.90 = 7,079.20 : x
  2. Step 2: Convert to fraction form
    8,148.40/12,246.90 = 7,079.20/x
  3. Step 3: Cross multiply
    8,148.40x = 12,246.90 × 7,079.20
  4. Step 4: Simplify right side
    8,148.40x = 86,698,254.48
  5. Step 5: Solve for x
    x = 86,698,254.48/8,148.40
  6. Step 6: Final answer
    x = 10,639.91

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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.