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Finding the Fourth Proportional to 18,658.94, 25,720.08 and 12,680.06

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Solution

The fourth proportional to 18,658.94, 25,720.08 and 12,680.06 is: 17,478.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,658.94 : 25,720.08 = 12,680.06 : x
  2. Step 2: Convert to fraction form
    18,658.94/25,720.08 = 12,680.06/x
  3. Step 3: Cross multiply
    18,658.94x = 25,720.08 × 12,680.06
  4. Step 4: Simplify right side
    18,658.94x = 326,132,157.60
  5. Step 5: Solve for x
    x = 326,132,157.60/18,658.94
  6. Step 6: Final answer
    x = 17,478.60

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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.