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Finding the Fourth Proportional to 18,968.40, 28,430.99 and 11,855.91

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Solution

The fourth proportional to 18,968.40, 28,430.99 and 11,855.91 is: 17,770.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,968.40 : 28,430.99 = 11,855.91 : x
  2. Step 2: Convert to fraction form
    18,968.40/28,430.99 = 11,855.91/x
  3. Step 3: Cross multiply
    18,968.40x = 28,430.99 × 11,855.91
  4. Step 4: Simplify right side
    18,968.40x = 337,075,258.65
  5. Step 5: Solve for x
    x = 337,075,258.65/18,968.40
  6. Step 6: Final answer
    x = 17,770.36

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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.