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Finding the Fourth Proportional to 21,208.65, 31,812.98 and 12,460.65

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Solution

The fourth proportional to 21,208.65, 31,812.98 and 12,460.65 is: 18,690.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.65 : 31,812.98 = 12,460.65 : x
  2. Step 2: Convert to fraction form
    21,208.65/31,812.98 = 12,460.65/x
  3. Step 3: Cross multiply
    21,208.65x = 31,812.98 × 12,460.65
  4. Step 4: Simplify right side
    21,208.65x = 396,410,346.93
  5. Step 5: Solve for x
    x = 396,410,346.93/21,208.65
  6. Step 6: Final answer
    x = 18,690.98

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.