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Finding the Fourth Proportional to 18,915.85, 26,075.87 and 12,108.88

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Solution

The fourth proportional to 18,915.85, 26,075.87 and 12,108.88 is: 16,692.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.85 : 26,075.87 = 12,108.88 : x
  2. Step 2: Convert to fraction form
    18,915.85/26,075.87 = 12,108.88/x
  3. Step 3: Cross multiply
    18,915.85x = 26,075.87 × 12,108.88
  4. Step 4: Simplify right side
    18,915.85x = 315,749,389.80
  5. Step 5: Solve for x
    x = 315,749,389.80/18,915.85
  6. Step 6: Final answer
    x = 16,692.32

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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.