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Finding the Fourth Proportional to 28,892.90, 43,243.35 and 20,972.90

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Solution

The fourth proportional to 28,892.90, 43,243.35 and 20,972.90 is: 31,389.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,892.90 : 43,243.35 = 20,972.90 : x
  2. Step 2: Convert to fraction form
    28,892.90/43,243.35 = 20,972.90/x
  3. Step 3: Cross multiply
    28,892.90x = 43,243.35 × 20,972.90
  4. Step 4: Simplify right side
    28,892.90x = 906,938,455.22
  5. Step 5: Solve for x
    x = 906,938,455.22/28,892.90
  6. Step 6: Final answer
    x = 31,389.67

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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.