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Finding the Fourth Proportional to 7,015.80, 9,681.81 and 3,871.98

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Solution

The fourth proportional to 7,015.80, 9,681.81 and 3,871.98 is: 5,343.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,015.80 : 9,681.81 = 3,871.98 : x
  2. Step 2: Convert to fraction form
    7,015.80/9,681.81 = 3,871.98/x
  3. Step 3: Cross multiply
    7,015.80x = 9,681.81 × 3,871.98
  4. Step 4: Simplify right side
    7,015.80x = 37,487,774.68
  5. Step 5: Solve for x
    x = 37,487,774.68/7,015.80
  6. Step 6: Final answer
    x = 5,343.34

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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.