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Finding the Fourth Proportional to 12,657.79, 18,986.01 and 3,891.57

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Solution

The fourth proportional to 12,657.79, 18,986.01 and 3,891.57 is: 5,837.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,657.79 : 18,986.01 = 3,891.57 : x
  2. Step 2: Convert to fraction form
    12,657.79/18,986.01 = 3,891.57/x
  3. Step 3: Cross multiply
    12,657.79x = 18,986.01 × 3,891.57
  4. Step 4: Simplify right side
    12,657.79x = 73,885,386.94
  5. Step 5: Solve for x
    x = 73,885,386.94/12,657.79
  6. Step 6: Final answer
    x = 5,837.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.