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Finding the Fourth Proportional to 15,005.64, 20,707.80 and 8,718

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Solution

The fourth proportional to 15,005.64, 20,707.80 and 8,718 is: 12,030.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,005.64 : 20,707.80 = 8,718 : x
  2. Step 2: Convert to fraction form
    15,005.64/20,707.80 = 8,718/x
  3. Step 3: Cross multiply
    15,005.64x = 20,707.80 × 8,718
  4. Step 4: Simplify right side
    15,005.64x = 180,530,600.40
  5. Step 5: Solve for x
    x = 180,530,600.40/15,005.64
  6. Step 6: Final answer
    x = 12,030.85

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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.