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Finding the Fourth Proportional to 20,907.68, 28,842.90 and 13,350.16

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Solution

The fourth proportional to 20,907.68, 28,842.90 and 13,350.16 is: 18,417.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,907.68 : 28,842.90 = 13,350.16 : x
  2. Step 2: Convert to fraction form
    20,907.68/28,842.90 = 13,350.16/x
  3. Step 3: Cross multiply
    20,907.68x = 28,842.90 × 13,350.16
  4. Step 4: Simplify right side
    20,907.68x = 385,057,185.65
  5. Step 5: Solve for x
    x = 385,057,185.65/20,907.68
  6. Step 6: Final answer
    x = 18,417.02

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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.