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Finding the Fourth Proportional to 15,865.57, 21,894.71 and 8,695.37

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Solution

The fourth proportional to 15,865.57, 21,894.71 and 8,695.37 is: 11,999.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.57 : 21,894.71 = 8,695.37 : x
  2. Step 2: Convert to fraction form
    15,865.57/21,894.71 = 8,695.37/x
  3. Step 3: Cross multiply
    15,865.57x = 21,894.71 × 8,695.37
  4. Step 4: Simplify right side
    15,865.57x = 190,382,492.59
  5. Step 5: Solve for x
    x = 190,382,492.59/15,865.57
  6. Step 6: Final answer
    x = 11,999.73

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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.