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Finding the Fourth Proportional to 28,124.16, 38,811.60 and 15,549.60

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Solution

The fourth proportional to 28,124.16, 38,811.60 and 15,549.60 is: 21,458.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,124.16 : 38,811.60 = 15,549.60 : x
  2. Step 2: Convert to fraction form
    28,124.16/38,811.60 = 15,549.60/x
  3. Step 3: Cross multiply
    28,124.16x = 38,811.60 × 15,549.60
  4. Step 4: Simplify right side
    28,124.16x = 603,504,855.36
  5. Step 5: Solve for x
    x = 603,504,855.36/28,124.16
  6. Step 6: Final answer
    x = 21,458.59

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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.