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Finding the Fourth Proportional to 8,580.36, 12,859.20 and 4,420.20

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Solution

The fourth proportional to 8,580.36, 12,859.20 and 4,420.20 is: 6,624.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,580.36 : 12,859.20 = 4,420.20 : x
  2. Step 2: Convert to fraction form
    8,580.36/12,859.20 = 4,420.20/x
  3. Step 3: Cross multiply
    8,580.36x = 12,859.20 × 4,420.20
  4. Step 4: Simplify right side
    8,580.36x = 56,840,235.84
  5. Step 5: Solve for x
    x = 56,840,235.84/8,580.36
  6. Step 6: Final answer
    x = 6,624.46

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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.