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Finding the Fourth Proportional to 8,718.78, 12,032.70 and 4,992.78

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Solution

The fourth proportional to 8,718.78, 12,032.70 and 4,992.78 is: 6,890.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,718.78 : 12,032.70 = 4,992.78 : x
  2. Step 2: Convert to fraction form
    8,718.78/12,032.70 = 4,992.78/x
  3. Step 3: Cross multiply
    8,718.78x = 12,032.70 × 4,992.78
  4. Step 4: Simplify right side
    8,718.78x = 60,076,623.91
  5. Step 5: Solve for x
    x = 60,076,623.91/8,718.78
  6. Step 6: Final answer
    x = 6,890.49

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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.