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Finding the Fourth Proportional to 7,142.01, 9,855.74 and 3,955.44

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Solution

The fourth proportional to 7,142.01, 9,855.74 and 3,955.44 is: 5,458.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,142.01 : 9,855.74 = 3,955.44 : x
  2. Step 2: Convert to fraction form
    7,142.01/9,855.74 = 3,955.44/x
  3. Step 3: Cross multiply
    7,142.01x = 9,855.74 × 3,955.44
  4. Step 4: Simplify right side
    7,142.01x = 38,983,779.63
  5. Step 5: Solve for x
    x = 38,983,779.63/7,142.01
  6. Step 6: Final answer
    x = 5,458.38

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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.