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Finding the Fourth Proportional to 28,969.92, 39,978.88 and 17,033.28

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Solution

The fourth proportional to 28,969.92, 39,978.88 and 17,033.28 is: 23,506.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,969.92 : 39,978.88 = 17,033.28 : x
  2. Step 2: Convert to fraction form
    28,969.92/39,978.88 = 17,033.28/x
  3. Step 3: Cross multiply
    28,969.92x = 39,978.88 × 17,033.28
  4. Step 4: Simplify right side
    28,969.92x = 680,971,457.13
  5. Step 5: Solve for x
    x = 680,971,457.13/28,969.92
  6. Step 6: Final answer
    x = 23,506.16

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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.