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Finding the Fourth Proportional to 12,705.80, 18,984.13 and 12,705.80

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Solution

The fourth proportional to 12,705.80, 18,984.13 and 12,705.80 is: 18,984.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,705.80 : 18,984.13 = 12,705.80 : x
  2. Step 2: Convert to fraction form
    12,705.80/18,984.13 = 12,705.80/x
  3. Step 3: Cross multiply
    12,705.80x = 18,984.13 × 12,705.80
  4. Step 4: Simplify right side
    12,705.80x = 241,208,558.95
  5. Step 5: Solve for x
    x = 241,208,558.95/12,705.80
  6. Step 6: Final answer
    x = 18,984.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.