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Finding the Fourth Proportional to 12,558.78, 18,809.01 and 10,478.70

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Solution

The fourth proportional to 12,558.78, 18,809.01 and 10,478.70 is: 15,693.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,558.78 : 18,809.01 = 10,478.70 : x
  2. Step 2: Convert to fraction form
    12,558.78/18,809.01 = 10,478.70/x
  3. Step 3: Cross multiply
    12,558.78x = 18,809.01 × 10,478.70
  4. Step 4: Simplify right side
    12,558.78x = 197,093,973.09
  5. Step 5: Solve for x
    x = 197,093,973.09/12,558.78
  6. Step 6: Final answer
    x = 15,693.72

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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.