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Finding the Fourth Proportional to 28,978.50, 39,992.76 and 18,364.26

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Solution

The fourth proportional to 28,978.50, 39,992.76 and 18,364.26 is: 25,344.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.50 : 39,992.76 = 18,364.26 : x
  2. Step 2: Convert to fraction form
    28,978.50/39,992.76 = 18,364.26/x
  3. Step 3: Cross multiply
    28,978.50x = 39,992.76 × 18,364.26
  4. Step 4: Simplify right side
    28,978.50x = 734,437,442.76
  5. Step 5: Solve for x
    x = 734,437,442.76/28,978.50
  6. Step 6: Final answer
    x = 25,344.22

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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.