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Finding the Fourth Proportional to 42,779.88, 64,163.88 and 13,198.68

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Solution

The fourth proportional to 42,779.88, 64,163.88 and 13,198.68 is: 19,796.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,779.88 : 64,163.88 = 13,198.68 : x
  2. Step 2: Convert to fraction form
    42,779.88/64,163.88 = 13,198.68/x
  3. Step 3: Cross multiply
    42,779.88x = 64,163.88 × 13,198.68
  4. Step 4: Simplify right side
    42,779.88x = 846,878,519.68
  5. Step 5: Solve for x
    x = 846,878,519.68/42,779.88
  6. Step 6: Final answer
    x = 19,796.19

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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.