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Finding the Fourth Proportional to 7,999.70, 12,005.04 and 2,805.57

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Solution

The fourth proportional to 7,999.70, 12,005.04 and 2,805.57 is: 4,210.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.70 : 12,005.04 = 2,805.57 : x
  2. Step 2: Convert to fraction form
    7,999.70/12,005.04 = 2,805.57/x
  3. Step 3: Cross multiply
    7,999.70x = 12,005.04 × 2,805.57
  4. Step 4: Simplify right side
    7,999.70x = 33,680,980.07
  5. Step 5: Solve for x
    x = 33,680,980.07/7,999.70
  6. Step 6: Final answer
    x = 4,210.28

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1.5x scale

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.