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Finding the Fourth Proportional to 18,989.70, 26,643.90 and 18,989.70

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Solution

The fourth proportional to 18,989.70, 26,643.90 and 18,989.70 is: 26,643.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.70 : 26,643.90 = 18,989.70 : x
  2. Step 2: Convert to fraction form
    18,989.70/26,643.90 = 18,989.70/x
  3. Step 3: Cross multiply
    18,989.70x = 26,643.90 × 18,989.70
  4. Step 4: Simplify right side
    18,989.70x = 505,959,667.83
  5. Step 5: Solve for x
    x = 505,959,667.83/18,989.70
  6. Step 6: Final answer
    x = 26,643.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.