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Finding the Fourth Proportional to 18,907.40, 28,361.10 and 10,137.80

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Solution

The fourth proportional to 18,907.40, 28,361.10 and 10,137.80 is: 15,206.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,907.40 : 28,361.10 = 10,137.80 : x
  2. Step 2: Convert to fraction form
    18,907.40/28,361.10 = 10,137.80/x
  3. Step 3: Cross multiply
    18,907.40x = 28,361.10 × 10,137.80
  4. Step 4: Simplify right side
    18,907.40x = 287,519,159.58
  5. Step 5: Solve for x
    x = 287,519,159.58/18,907.40
  6. Step 6: Final answer
    x = 15,206.70

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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.