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Finding the Fourth Proportional to 8,666.40, 12,999.60 and 3,119.93

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Solution

The fourth proportional to 8,666.40, 12,999.60 and 3,119.93 is: 4,679.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.40 : 12,999.60 = 3,119.93 : x
  2. Step 2: Convert to fraction form
    8,666.40/12,999.60 = 3,119.93/x
  3. Step 3: Cross multiply
    8,666.40x = 12,999.60 × 3,119.93
  4. Step 4: Simplify right side
    8,666.40x = 40,557,842.03
  5. Step 5: Solve for x
    x = 40,557,842.03/8,666.40
  6. Step 6: Final answer
    x = 4,679.90

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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.