Home / 7,813.02-11,707.79-3,128.39

Finding the Fourth Proportional to 7,813.02, 11,707.79 and 3,128.39

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Solution

The fourth proportional to 7,813.02, 11,707.79 and 3,128.39 is: 4,687.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,813.02 : 11,707.79 = 3,128.39 : x
  2. Step 2: Convert to fraction form
    7,813.02/11,707.79 = 3,128.39/x
  3. Step 3: Cross multiply
    7,813.02x = 11,707.79 × 3,128.39
  4. Step 4: Simplify right side
    7,813.02x = 36,626,533.16
  5. Step 5: Solve for x
    x = 36,626,533.16/7,813.02
  6. Step 6: Final answer
    x = 4,687.88

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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.