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Finding the Fourth Proportional to 74,779.56, 103,189.14 and 42,945.48

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Solution

The fourth proportional to 74,779.56, 103,189.14 and 42,945.48 is: 59,260.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,779.56 : 103,189.14 = 42,945.48 : x
  2. Step 2: Convert to fraction form
    74,779.56/103,189.14 = 42,945.48/x
  3. Step 3: Cross multiply
    74,779.56x = 103,189.14 × 42,945.48
  4. Step 4: Simplify right side
    74,779.56x = 4,431,507,148.09
  5. Step 5: Solve for x
    x = 4,431,507,148.09/74,779.56
  6. Step 6: Final answer
    x = 59,260.94

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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.