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Finding the Fourth Proportional to 7,185.42, 9,921.15 and 4,394.70

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Solution

The fourth proportional to 7,185.42, 9,921.15 and 4,394.70 is: 6,067.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185.42 : 9,921.15 = 4,394.70 : x
  2. Step 2: Convert to fraction form
    7,185.42/9,921.15 = 4,394.70/x
  3. Step 3: Cross multiply
    7,185.42x = 9,921.15 × 4,394.70
  4. Step 4: Simplify right side
    7,185.42x = 43,600,477.91
  5. Step 5: Solve for x
    x = 43,600,477.91/7,185.42
  6. Step 6: Final answer
    x = 6,067.91

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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.