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Finding the Fourth Proportional to 15,075.70, 20,803.16 and 8,361.20

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Solution

The fourth proportional to 15,075.70, 20,803.16 and 8,361.20 is: 11,537.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,075.70 : 20,803.16 = 8,361.20 : x
  2. Step 2: Convert to fraction form
    15,075.70/20,803.16 = 8,361.20/x
  3. Step 3: Cross multiply
    15,075.70x = 20,803.16 × 8,361.20
  4. Step 4: Simplify right side
    15,075.70x = 173,939,381.39
  5. Step 5: Solve for x
    x = 173,939,381.39/15,075.70
  6. Step 6: Final answer
    x = 11,537.73

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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.