Home / 8,905.07-12,289.91-5,128.38

Finding the Fourth Proportional to 8,905.07, 12,289.91 and 5,128.38

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Solution

The fourth proportional to 8,905.07, 12,289.91 and 5,128.38 is: 7,077.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.07 : 12,289.91 = 5,128.38 : x
  2. Step 2: Convert to fraction form
    8,905.07/12,289.91 = 5,128.38/x
  3. Step 3: Cross multiply
    8,905.07x = 12,289.91 × 5,128.38
  4. Step 4: Simplify right side
    8,905.07x = 63,027,303.00
  5. Step 5: Solve for x
    x = 63,027,303.00/8,905.07
  6. Step 6: Final answer
    x = 7,077.69

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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.