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Finding the Fourth Proportional to 28,392.48, 39,179.76 and 15,816.48

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Solution

The fourth proportional to 28,392.48, 39,179.76 and 15,816.48 is: 21,825.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,392.48 : 39,179.76 = 15,816.48 : x
  2. Step 2: Convert to fraction form
    28,392.48/39,179.76 = 15,816.48/x
  3. Step 3: Cross multiply
    28,392.48x = 39,179.76 × 15,816.48
  4. Step 4: Simplify right side
    28,392.48x = 619,685,890.44
  5. Step 5: Solve for x
    x = 619,685,890.44/28,392.48
  6. Step 6: Final answer
    x = 21,825.70

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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.