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Finding the Fourth Proportional to 4,991.51, 6,890.78 and 3,869.93

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Solution

The fourth proportional to 4,991.51, 6,890.78 and 3,869.93 is: 5,342.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,991.51 : 6,890.78 = 3,869.93 : x
  2. Step 2: Convert to fraction form
    4,991.51/6,890.78 = 3,869.93/x
  3. Step 3: Cross multiply
    4,991.51x = 6,890.78 × 3,869.93
  4. Step 4: Simplify right side
    4,991.51x = 26,666,836.25
  5. Step 5: Solve for x
    x = 26,666,836.25/4,991.51
  6. Step 6: Final answer
    x = 5,342.44

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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.