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Finding the Fourth Proportional to 12,428.65, 18,652.29 and 7,755.49

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Solution

The fourth proportional to 12,428.65, 18,652.29 and 7,755.49 is: 11,639.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,428.65 : 18,652.29 = 7,755.49 : x
  2. Step 2: Convert to fraction form
    12,428.65/18,652.29 = 7,755.49/x
  3. Step 3: Cross multiply
    12,428.65x = 18,652.29 × 7,755.49
  4. Step 4: Simplify right side
    12,428.65x = 144,657,648.57
  5. Step 5: Solve for x
    x = 144,657,648.57/12,428.65
  6. Step 6: Final answer
    x = 11,639.05

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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.