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Finding the Fourth Proportional to 14,989.80, 20,683.86 and 8,615.91

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Solution

The fourth proportional to 14,989.80, 20,683.86 and 8,615.91 is: 11,888.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,989.80 : 20,683.86 = 8,615.91 : x
  2. Step 2: Convert to fraction form
    14,989.80/20,683.86 = 8,615.91/x
  3. Step 3: Cross multiply
    14,989.80x = 20,683.86 × 8,615.91
  4. Step 4: Simplify right side
    14,989.80x = 178,210,276.21
  5. Step 5: Solve for x
    x = 178,210,276.21/14,989.80
  6. Step 6: Final answer
    x = 11,888.77

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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.