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Finding the Fourth Proportional to 12,991.14, 17,927.93 and 7,885.18

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Solution

The fourth proportional to 12,991.14, 17,927.93 and 7,885.18 is: 10,881.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.14 : 17,927.93 = 7,885.18 : x
  2. Step 2: Convert to fraction form
    12,991.14/17,927.93 = 7,885.18/x
  3. Step 3: Cross multiply
    12,991.14x = 17,927.93 × 7,885.18
  4. Step 4: Simplify right side
    12,991.14x = 141,364,865.44
  5. Step 5: Solve for x
    x = 141,364,865.44/12,991.14
  6. Step 6: Final answer
    x = 10,881.64

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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.