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Finding the Fourth Proportional to 28,197.56, 38,911.09 and 15,448.40

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Solution

The fourth proportional to 28,197.56, 38,911.09 and 15,448.40 is: 21,317.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,197.56 : 38,911.09 = 15,448.40 : x
  2. Step 2: Convert to fraction form
    28,197.56/38,911.09 = 15,448.40/x
  3. Step 3: Cross multiply
    28,197.56x = 38,911.09 × 15,448.40
  4. Step 4: Simplify right side
    28,197.56x = 601,114,082.76
  5. Step 5: Solve for x
    x = 601,114,082.76/28,197.56
  6. Step 6: Final answer
    x = 21,317.95

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1.5x scale

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.