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Finding the Fourth Proportional to 28,708.56, 39,612.24 and 18,636.24

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Solution

The fourth proportional to 28,708.56, 39,612.24 and 18,636.24 is: 25,714.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,708.56 : 39,612.24 = 18,636.24 : x
  2. Step 2: Convert to fraction form
    28,708.56/39,612.24 = 18,636.24/x
  3. Step 3: Cross multiply
    28,708.56x = 39,612.24 × 18,636.24
  4. Step 4: Simplify right side
    28,708.56x = 738,223,211.58
  5. Step 5: Solve for x
    x = 738,223,211.58/28,708.56
  6. Step 6: Final answer
    x = 25,714.39

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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.