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Finding the Fourth Proportional to 8,970.72, 12,381 and 8,679.32

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Solution

The fourth proportional to 8,970.72, 12,381 and 8,679.32 is: 11,978.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,970.72 : 12,381 = 8,679.32 : x
  2. Step 2: Convert to fraction form
    8,970.72/12,381 = 8,679.32/x
  3. Step 3: Cross multiply
    8,970.72x = 12,381 × 8,679.32
  4. Step 4: Simplify right side
    8,970.72x = 107,458,660.92
  5. Step 5: Solve for x
    x = 107,458,660.92/8,970.72
  6. Step 6: Final answer
    x = 11,978.82

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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.