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Finding the Fourth Proportional to 18,657.75, 25,703.90 and 12,982.75

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Solution

The fourth proportional to 18,657.75, 25,703.90 and 12,982.75 is: 17,885.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,657.75 : 25,703.90 = 12,982.75 : x
  2. Step 2: Convert to fraction form
    18,657.75/25,703.90 = 12,982.75/x
  3. Step 3: Cross multiply
    18,657.75x = 25,703.90 × 12,982.75
  4. Step 4: Simplify right side
    18,657.75x = 333,707,307.07
  5. Step 5: Solve for x
    x = 333,707,307.07/18,657.75
  6. Step 6: Final answer
    x = 17,885.72

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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.