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Finding the Fourth Proportional to 101,071.80, 139,403.70 and 74,205.72

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Solution

The fourth proportional to 101,071.80, 139,403.70 and 74,205.72 is: 102,348.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,071.80 : 139,403.70 = 74,205.72 : x
  2. Step 2: Convert to fraction form
    101,071.80/139,403.70 = 74,205.72/x
  3. Step 3: Cross multiply
    101,071.80x = 139,403.70 × 74,205.72
  4. Step 4: Simplify right side
    101,071.80x = 10,344,551,929.16
  5. Step 5: Solve for x
    x = 10,344,551,929.16/101,071.80
  6. Step 6: Final answer
    x = 102,348.55

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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.