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Finding the Fourth Proportional to 15,804.42, 21,809.79 and 8,730.78

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Solution

The fourth proportional to 15,804.42, 21,809.79 and 8,730.78 is: 12,048.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,804.42 : 21,809.79 = 8,730.78 : x
  2. Step 2: Convert to fraction form
    15,804.42/21,809.79 = 8,730.78/x
  3. Step 3: Cross multiply
    15,804.42x = 21,809.79 × 8,730.78
  4. Step 4: Simplify right side
    15,804.42x = 190,416,478.34
  5. Step 5: Solve for x
    x = 190,416,478.34/15,804.42
  6. Step 6: Final answer
    x = 12,048.31

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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.