Home / 8,905.49-12,289.70-5,129.32

Finding the Fourth Proportional to 8,905.49, 12,289.70 and 5,129.32

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Solution

The fourth proportional to 8,905.49, 12,289.70 and 5,129.32 is: 7,078.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.49 : 12,289.70 = 5,129.32 : x
  2. Step 2: Convert to fraction form
    8,905.49/12,289.70 = 5,129.32/x
  3. Step 3: Cross multiply
    8,905.49x = 12,289.70 × 5,129.32
  4. Step 4: Simplify right side
    8,905.49x = 63,037,778.36
  5. Step 5: Solve for x
    x = 63,037,778.36/8,905.49
  6. Step 6: Final answer
    x = 7,078.53

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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.