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Finding the Fourth Proportional to 12,605.64, 18,785.58 and 12,225.58

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Solution

The fourth proportional to 12,605.64, 18,785.58 and 12,225.58 is: 18,219.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,605.64 : 18,785.58 = 12,225.58 : x
  2. Step 2: Convert to fraction form
    12,605.64/18,785.58 = 12,225.58/x
  3. Step 3: Cross multiply
    12,605.64x = 18,785.58 × 12,225.58
  4. Step 4: Simplify right side
    12,605.64x = 229,664,611.14
  5. Step 5: Solve for x
    x = 229,664,611.14/12,605.64
  6. Step 6: Final answer
    x = 18,219.19

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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.