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Finding the Fourth Proportional to 15,685.94, 21,647.00 and 8,879.45

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Solution

The fourth proportional to 15,685.94, 21,647.00 and 8,879.45 is: 12,253.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.94 : 21,647.00 = 8,879.45 : x
  2. Step 2: Convert to fraction form
    15,685.94/21,647.00 = 8,879.45/x
  3. Step 3: Cross multiply
    15,685.94x = 21,647.00 × 8,879.45
  4. Step 4: Simplify right side
    15,685.94x = 192,213,301.52
  5. Step 5: Solve for x
    x = 192,213,301.52/15,685.94
  6. Step 6: Final answer
    x = 12,253.86

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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.