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Finding the Fourth Proportional to 20,419.86, 30,639.87 and 9,898.74

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Solution

The fourth proportional to 20,419.86, 30,639.87 and 9,898.74 is: 14,853.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.86 : 30,639.87 = 9,898.74 : x
  2. Step 2: Convert to fraction form
    20,419.86/30,639.87 = 9,898.74/x
  3. Step 3: Cross multiply
    20,419.86x = 30,639.87 × 9,898.74
  4. Step 4: Simplify right side
    20,419.86x = 303,296,106.76
  5. Step 5: Solve for x
    x = 303,296,106.76/20,419.86
  6. Step 6: Final answer
    x = 14,853.00

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1.5x scale

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.