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Finding the Fourth Proportional to 28,838.40, 43,161.60 and 20,918.40

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Solution

The fourth proportional to 28,838.40, 43,161.60 and 20,918.40 is: 31,307.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,838.40 : 43,161.60 = 20,918.40 : x
  2. Step 2: Convert to fraction form
    28,838.40/43,161.60 = 20,918.40/x
  3. Step 3: Cross multiply
    28,838.40x = 43,161.60 × 20,918.40
  4. Step 4: Simplify right side
    28,838.40x = 902,871,613.44
  5. Step 5: Solve for x
    x = 902,871,613.44/28,838.40
  6. Step 6: Final answer
    x = 31,307.96

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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.