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Finding the Fourth Proportional to 15,678.46, 21,636.25 and 8,964.21

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Solution

The fourth proportional to 15,678.46, 21,636.25 and 8,964.21 is: 12,370.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.46 : 21,636.25 = 8,964.21 : x
  2. Step 2: Convert to fraction form
    15,678.46/21,636.25 = 8,964.21/x
  3. Step 3: Cross multiply
    15,678.46x = 21,636.25 × 8,964.21
  4. Step 4: Simplify right side
    15,678.46x = 193,951,888.61
  5. Step 5: Solve for x
    x = 193,951,888.61/15,678.46
  6. Step 6: Final answer
    x = 12,370.60

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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.