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Finding the Fourth Proportional to 101,101.29, 139,518.90 and 55,779.68

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Solution

The fourth proportional to 101,101.29, 139,518.90 and 55,779.68 is: 76,975.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,101.29 : 139,518.90 = 55,779.68 : x
  2. Step 2: Convert to fraction form
    101,101.29/139,518.90 = 55,779.68/x
  3. Step 3: Cross multiply
    101,101.29x = 139,518.90 × 55,779.68
  4. Step 4: Simplify right side
    101,101.29x = 7,782,318,898.36
  5. Step 5: Solve for x
    x = 7,782,318,898.36/101,101.29
  6. Step 6: Final answer
    x = 76,975.47

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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.