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Finding the Fourth Proportional to 84,240.50, 126,368.04 and 21,911

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Solution

The fourth proportional to 84,240.50, 126,368.04 and 21,911 is: 32,868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,240.50 : 126,368.04 = 21,911 : x
  2. Step 2: Convert to fraction form
    84,240.50/126,368.04 = 21,911/x
  3. Step 3: Cross multiply
    84,240.50x = 126,368.04 × 21,911
  4. Step 4: Simplify right side
    84,240.50x = 2,768,850,124.44
  5. Step 5: Solve for x
    x = 2,768,850,124.44/84,240.50
  6. Step 6: Final answer
    x = 32,868.40

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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.