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Finding the Fourth Proportional to 20,479.94, 30,707.28 and 9,390.03

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Solution

The fourth proportional to 20,479.94, 30,707.28 and 9,390.03 is: 14,079.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.94 : 30,707.28 = 9,390.03 : x
  2. Step 2: Convert to fraction form
    20,479.94/30,707.28 = 9,390.03/x
  3. Step 3: Cross multiply
    20,479.94x = 30,707.28 × 9,390.03
  4. Step 4: Simplify right side
    20,479.94x = 288,342,280.42
  5. Step 5: Solve for x
    x = 288,342,280.42/20,479.94
  6. Step 6: Final answer
    x = 14,079.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.