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Finding the Fourth Proportional to 20,148.80, 30,223.20 and 19,889.60

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Solution

The fourth proportional to 20,148.80, 30,223.20 and 19,889.60 is: 29,834.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,148.80 : 30,223.20 = 19,889.60 : x
  2. Step 2: Convert to fraction form
    20,148.80/30,223.20 = 19,889.60/x
  3. Step 3: Cross multiply
    20,148.80x = 30,223.20 × 19,889.60
  4. Step 4: Simplify right side
    20,148.80x = 601,127,358.72
  5. Step 5: Solve for x
    x = 601,127,358.72/20,148.80
  6. Step 6: Final answer
    x = 29,834.40

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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.