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Finding the Fourth Proportional to 12,607.42, 18,911.13 and 12,589.20

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Solution

The fourth proportional to 12,607.42, 18,911.13 and 12,589.20 is: 18,883.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,607.42 : 18,911.13 = 12,589.20 : x
  2. Step 2: Convert to fraction form
    12,607.42/18,911.13 = 12,589.20/x
  3. Step 3: Cross multiply
    12,607.42x = 18,911.13 × 12,589.20
  4. Step 4: Simplify right side
    12,607.42x = 238,075,997.80
  5. Step 5: Solve for x
    x = 238,075,997.80/12,607.42
  6. Step 6: Final answer
    x = 18,883.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.