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Finding the Fourth Proportional to 8,457.88, 12,690.99 and 6,390.52

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Solution

The fourth proportional to 8,457.88, 12,690.99 and 6,390.52 is: 9,588.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,457.88 : 12,690.99 = 6,390.52 : x
  2. Step 2: Convert to fraction form
    8,457.88/12,690.99 = 6,390.52/x
  3. Step 3: Cross multiply
    8,457.88x = 12,690.99 × 6,390.52
  4. Step 4: Simplify right side
    8,457.88x = 81,102,025.41
  5. Step 5: Solve for x
    x = 81,102,025.41/8,457.88
  6. Step 6: Final answer
    x = 9,588.93

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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.