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Finding the Fourth Proportional to 28,688.60, 43,032.90 and 20,912.60

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Solution

The fourth proportional to 28,688.60, 43,032.90 and 20,912.60 is: 31,368.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,688.60 : 43,032.90 = 20,912.60 : x
  2. Step 2: Convert to fraction form
    28,688.60/43,032.90 = 20,912.60/x
  3. Step 3: Cross multiply
    28,688.60x = 43,032.90 × 20,912.60
  4. Step 4: Simplify right side
    28,688.60x = 899,929,824.54
  5. Step 5: Solve for x
    x = 899,929,824.54/28,688.60
  6. Step 6: Final answer
    x = 31,368.90

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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.