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Finding the Fourth Proportional to 62,638, 86,485.80 and 40,320.88

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Solution

The fourth proportional to 62,638, 86,485.80 and 40,320.88 is: 55,672.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,638 : 86,485.80 = 40,320.88 : x
  2. Step 2: Convert to fraction form
    62,638/86,485.80 = 40,320.88/x
  3. Step 3: Cross multiply
    62,638x = 86,485.80 × 40,320.88
  4. Step 4: Simplify right side
    62,638x = 3,487,183,563.50
  5. Step 5: Solve for x
    x = 3,487,183,563.50/62,638
  6. Step 6: Final answer
    x = 55,672.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.