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Finding the Fourth Proportional to 12,477.71, 18,720.32 and 7,485.58

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Solution

The fourth proportional to 12,477.71, 18,720.32 and 7,485.58 is: 11,230.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,477.71 : 18,720.32 = 7,485.58 : x
  2. Step 2: Convert to fraction form
    12,477.71/18,720.32 = 7,485.58/x
  3. Step 3: Cross multiply
    12,477.71x = 18,720.32 × 7,485.58
  4. Step 4: Simplify right side
    12,477.71x = 140,132,481.06
  5. Step 5: Solve for x
    x = 140,132,481.06/12,477.71
  6. Step 6: Final answer
    x = 11,230.62

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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.