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Finding the Fourth Proportional to 18,821.51, 28,237.01 and 13,285.67

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Solution

The fourth proportional to 18,821.51, 28,237.01 and 13,285.67 is: 19,931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.51 : 28,237.01 = 13,285.67 : x
  2. Step 2: Convert to fraction form
    18,821.51/28,237.01 = 13,285.67/x
  3. Step 3: Cross multiply
    18,821.51x = 28,237.01 × 13,285.67
  4. Step 4: Simplify right side
    18,821.51x = 375,147,389.03
  5. Step 5: Solve for x
    x = 375,147,389.03/18,821.51
  6. Step 6: Final answer
    x = 19,931.85

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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.