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Finding the Fourth Proportional to 8,665.40, 12,998.10 and 3,118.93

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Solution

The fourth proportional to 8,665.40, 12,998.10 and 3,118.93 is: 4,678.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.40 : 12,998.10 = 3,118.93 : x
  2. Step 2: Convert to fraction form
    8,665.40/12,998.10 = 3,118.93/x
  3. Step 3: Cross multiply
    8,665.40x = 12,998.10 × 3,118.93
  4. Step 4: Simplify right side
    8,665.40x = 40,540,164.03
  5. Step 5: Solve for x
    x = 40,540,164.03/8,665.40
  6. Step 6: Final answer
    x = 4,678.40

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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.