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Finding the Fourth Proportional to 42,635.81, 63,942.80 and 12,643.03

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Solution

The fourth proportional to 42,635.81, 63,942.80 and 12,643.03 is: 18,961.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,635.81 : 63,942.80 = 12,643.03 : x
  2. Step 2: Convert to fraction form
    42,635.81/63,942.80 = 12,643.03/x
  3. Step 3: Cross multiply
    42,635.81x = 63,942.80 × 12,643.03
  4. Step 4: Simplify right side
    42,635.81x = 808,430,355.75
  5. Step 5: Solve for x
    x = 808,430,355.75/42,635.81
  6. Step 6: Final answer
    x = 18,961.30

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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.