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Finding the Fourth Proportional to 28,612.86, 39,485.03 and 15,866.09

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Solution

The fourth proportional to 28,612.86, 39,485.03 and 15,866.09 is: 21,894.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.86 : 39,485.03 = 15,866.09 : x
  2. Step 2: Convert to fraction form
    28,612.86/39,485.03 = 15,866.09/x
  3. Step 3: Cross multiply
    28,612.86x = 39,485.03 × 15,866.09
  4. Step 4: Simplify right side
    28,612.86x = 626,473,039.63
  5. Step 5: Solve for x
    x = 626,473,039.63/28,612.86
  6. Step 6: Final answer
    x = 21,894.81

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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.