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Finding the Fourth Proportional to 74,720.69, 103,113.23 and 40,729.47

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Solution

The fourth proportional to 74,720.69, 103,113.23 and 40,729.47 is: 56,205.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,720.69 : 103,113.23 = 40,729.47 : x
  2. Step 2: Convert to fraction form
    74,720.69/103,113.23 = 40,729.47/x
  3. Step 3: Cross multiply
    74,720.69x = 103,113.23 × 40,729.47
  4. Step 4: Simplify right side
    74,720.69x = 4,199,747,602.14
  5. Step 5: Solve for x
    x = 4,199,747,602.14/74,720.69
  6. Step 6: Final answer
    x = 56,205.95

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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.