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Finding the Fourth Proportional to 18,710.90, 25,823.88 and 11,639.60

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Solution

The fourth proportional to 18,710.90, 25,823.88 and 11,639.60 is: 16,064.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,710.90 : 25,823.88 = 11,639.60 : x
  2. Step 2: Convert to fraction form
    18,710.90/25,823.88 = 11,639.60/x
  3. Step 3: Cross multiply
    18,710.90x = 25,823.88 × 11,639.60
  4. Step 4: Simplify right side
    18,710.90x = 300,579,633.65
  5. Step 5: Solve for x
    x = 300,579,633.65/18,710.90
  6. Step 6: Final answer
    x = 16,064.41

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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.