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Finding the Fourth Proportional to 74,939.81, 103,420.88 and 43,113.50

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Solution

The fourth proportional to 74,939.81, 103,420.88 and 43,113.50 is: 59,498.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,939.81 : 103,420.88 = 43,113.50 : x
  2. Step 2: Convert to fraction form
    74,939.81/103,420.88 = 43,113.50/x
  3. Step 3: Cross multiply
    74,939.81x = 103,420.88 × 43,113.50
  4. Step 4: Simplify right side
    74,939.81x = 4,458,835,377.21
  5. Step 5: Solve for x
    x = 4,458,835,377.21/74,939.81
  6. Step 6: Final answer
    x = 59,498.89

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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.