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Finding the Fourth Proportional to 12,907.68, 17,811.86 and 7,164.84

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Solution

The fourth proportional to 12,907.68, 17,811.86 and 7,164.84 is: 9,887.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,907.68 : 17,811.86 = 7,164.84 : x
  2. Step 2: Convert to fraction form
    12,907.68/17,811.86 = 7,164.84/x
  3. Step 3: Cross multiply
    12,907.68x = 17,811.86 × 7,164.84
  4. Step 4: Simplify right side
    12,907.68x = 127,619,127.00
  5. Step 5: Solve for x
    x = 127,619,127.00/12,907.68
  6. Step 6: Final answer
    x = 9,887.07

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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.