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Finding the Fourth Proportional to 18,255, 25,191.90 and 9,871.50

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Solution

The fourth proportional to 18,255, 25,191.90 and 9,871.50 is: 13,622.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,255 : 25,191.90 = 9,871.50 : x
  2. Step 2: Convert to fraction form
    18,255/25,191.90 = 9,871.50/x
  3. Step 3: Cross multiply
    18,255x = 25,191.90 × 9,871.50
  4. Step 4: Simplify right side
    18,255x = 248,681,840.85
  5. Step 5: Solve for x
    x = 248,681,840.85/18,255
  6. Step 6: Final answer
    x = 13,622.67

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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.