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Finding the Fourth Proportional to 28,979, 39,993.46 and 18,364.76

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Solution

The fourth proportional to 28,979, 39,993.46 and 18,364.76 is: 25,344.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,979 : 39,993.46 = 18,364.76 : x
  2. Step 2: Convert to fraction form
    28,979/39,993.46 = 18,364.76/x
  3. Step 3: Cross multiply
    28,979x = 39,993.46 × 18,364.76
  4. Step 4: Simplify right side
    28,979x = 734,470,294.47
  5. Step 5: Solve for x
    x = 734,470,294.47/28,979
  6. Step 6: Final answer
    x = 25,344.92

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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.