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Finding the Fourth Proportional to 12,689.66, 18,993.08 and 11,477.18

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Solution

The fourth proportional to 12,689.66, 18,993.08 and 11,477.18 is: 17,178.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.66 : 18,993.08 = 11,477.18 : x
  2. Step 2: Convert to fraction form
    12,689.66/18,993.08 = 11,477.18/x
  3. Step 3: Cross multiply
    12,689.66x = 18,993.08 × 11,477.18
  4. Step 4: Simplify right side
    12,689.66x = 217,986,931.64
  5. Step 5: Solve for x
    x = 217,986,931.64/12,689.66
  6. Step 6: Final answer
    x = 17,178.32

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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.