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Finding the Fourth Proportional to 128,466.40, 192,692.40 and 39,719.20

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Solution

The fourth proportional to 128,466.40, 192,692.40 and 39,719.20 is: 59,576.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,466.40 : 192,692.40 = 39,719.20 : x
  2. Step 2: Convert to fraction form
    128,466.40/192,692.40 = 39,719.20/x
  3. Step 3: Cross multiply
    128,466.40x = 192,692.40 × 39,719.20
  4. Step 4: Simplify right side
    128,466.40x = 7,653,587,974.08
  5. Step 5: Solve for x
    x = 7,653,587,974.08/128,466.40
  6. Step 6: Final answer
    x = 59,576.57

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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.