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Finding the Fourth Proportional to 28,568.69, 39,424.79 and 17,390.69

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Solution

The fourth proportional to 28,568.69, 39,424.79 and 17,390.69 is: 23,999.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,568.69 : 39,424.79 = 17,390.69 : x
  2. Step 2: Convert to fraction form
    28,568.69/39,424.79 = 17,390.69/x
  3. Step 3: Cross multiply
    28,568.69x = 39,424.79 × 17,390.69
  4. Step 4: Simplify right side
    28,568.69x = 685,624,301.21
  5. Step 5: Solve for x
    x = 685,624,301.21/28,568.69
  6. Step 6: Final answer
    x = 23,999.15

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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.