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Finding the Fourth Proportional to 8,415.81, 12,609.76 and 5,118.93

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Solution

The fourth proportional to 8,415.81, 12,609.76 and 5,118.93 is: 7,669.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415.81 : 12,609.76 = 5,118.93 : x
  2. Step 2: Convert to fraction form
    8,415.81/12,609.76 = 5,118.93/x
  3. Step 3: Cross multiply
    8,415.81x = 12,609.76 × 5,118.93
  4. Step 4: Simplify right side
    8,415.81x = 64,548,478.76
  5. Step 5: Solve for x
    x = 64,548,478.76/8,415.81
  6. Step 6: Final answer
    x = 7,669.91

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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.