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Finding the Fourth Proportional to 28,255.56, 38,991.12 and 15,679.56

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Solution

The fourth proportional to 28,255.56, 38,991.12 and 15,679.56 is: 21,636.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,255.56 : 38,991.12 = 15,679.56 : x
  2. Step 2: Convert to fraction form
    28,255.56/38,991.12 = 15,679.56/x
  3. Step 3: Cross multiply
    28,255.56x = 38,991.12 × 15,679.56
  4. Step 4: Simplify right side
    28,255.56x = 611,363,605.51
  5. Step 5: Solve for x
    x = 611,363,605.51/28,255.56
  6. Step 6: Final answer
    x = 21,636.93

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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.