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Finding the Fourth Proportional to 15,661.86, 21,612.12 and 8,946.54

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Solution

The fourth proportional to 15,661.86, 21,612.12 and 8,946.54 is: 12,345.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.86 : 21,612.12 = 8,946.54 : x
  2. Step 2: Convert to fraction form
    15,661.86/21,612.12 = 8,946.54/x
  3. Step 3: Cross multiply
    15,661.86x = 21,612.12 × 8,946.54
  4. Step 4: Simplify right side
    15,661.86x = 193,353,696.06
  5. Step 5: Solve for x
    x = 193,353,696.06/15,661.86
  6. Step 6: Final answer
    x = 12,345.51

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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.