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Finding the Fourth Proportional to 28,409.80, 39,193.16 and 16,918.28

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Solution

The fourth proportional to 28,409.80, 39,193.16 and 16,918.28 is: 23,339.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.80 : 39,193.16 = 16,918.28 : x
  2. Step 2: Convert to fraction form
    28,409.80/39,193.16 = 16,918.28/x
  3. Step 3: Cross multiply
    28,409.80x = 39,193.16 × 16,918.28
  4. Step 4: Simplify right side
    28,409.80x = 663,080,854.96
  5. Step 5: Solve for x
    x = 663,080,854.96/28,409.80
  6. Step 6: Final answer
    x = 23,339.86

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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.