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Finding the Fourth Proportional to 28,143.69, 38,839.51 and 15,568.44

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Solution

The fourth proportional to 28,143.69, 38,839.51 and 15,568.44 is: 21,485.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.69 : 38,839.51 = 15,568.44 : x
  2. Step 2: Convert to fraction form
    28,143.69/38,839.51 = 15,568.44/x
  3. Step 3: Cross multiply
    28,143.69x = 38,839.51 × 15,568.44
  4. Step 4: Simplify right side
    28,143.69x = 604,670,581.06
  5. Step 5: Solve for x
    x = 604,670,581.06/28,143.69
  6. Step 6: Final answer
    x = 21,485.12

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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.