Home / 21,135.12-29,138.83-18,182.67

Finding the Fourth Proportional to 21,135.12, 29,138.83 and 18,182.67

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Solution

The fourth proportional to 21,135.12, 29,138.83 and 18,182.67 is: 25,068.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.12 : 29,138.83 = 18,182.67 : x
  2. Step 2: Convert to fraction form
    21,135.12/29,138.83 = 18,182.67/x
  3. Step 3: Cross multiply
    21,135.12x = 29,138.83 × 18,182.67
  4. Step 4: Simplify right side
    21,135.12x = 529,821,730.08
  5. Step 5: Solve for x
    x = 529,821,730.08/21,135.12
  6. Step 6: Final answer
    x = 25,068.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.