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Finding the Fourth Proportional to 28,969.22, 39,978.09 and 18,904.10

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Solution

The fourth proportional to 28,969.22, 39,978.09 and 18,904.10 is: 26,088.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,969.22 : 39,978.09 = 18,904.10 : x
  2. Step 2: Convert to fraction form
    28,969.22/39,978.09 = 18,904.10/x
  3. Step 3: Cross multiply
    28,969.22x = 39,978.09 × 18,904.10
  4. Step 4: Simplify right side
    28,969.22x = 755,749,811.17
  5. Step 5: Solve for x
    x = 755,749,811.17/28,969.22
  6. Step 6: Final answer
    x = 26,088.03

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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.