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Finding the Fourth Proportional to 18,810.30, 28,215.69 and 12,965.34

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Solution

The fourth proportional to 18,810.30, 28,215.69 and 12,965.34 is: 19,448.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.30 : 28,215.69 = 12,965.34 : x
  2. Step 2: Convert to fraction form
    18,810.30/28,215.69 = 12,965.34/x
  3. Step 3: Cross multiply
    18,810.30x = 28,215.69 × 12,965.34
  4. Step 4: Simplify right side
    18,810.30x = 365,826,014.18
  5. Step 5: Solve for x
    x = 365,826,014.18/18,810.30
  6. Step 6: Final answer
    x = 19,448.18

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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.