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Finding the Fourth Proportional to 8,905.75, 12,289.80 and 6,358.21

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Solution

The fourth proportional to 8,905.75, 12,289.80 and 6,358.21 is: 8,774.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.75 : 12,289.80 = 6,358.21 : x
  2. Step 2: Convert to fraction form
    8,905.75/12,289.80 = 6,358.21/x
  3. Step 3: Cross multiply
    8,905.75x = 12,289.80 × 6,358.21
  4. Step 4: Simplify right side
    8,905.75x = 78,141,129.26
  5. Step 5: Solve for x
    x = 78,141,129.26/8,905.75
  6. Step 6: Final answer
    x = 8,774.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.