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Finding the Fourth Proportional to 139,742.13, 209,645.69 and 39,903.69

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Solution

The fourth proportional to 139,742.13, 209,645.69 and 39,903.69 is: 59,864.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,742.13 : 209,645.69 = 39,903.69 : x
  2. Step 2: Convert to fraction form
    139,742.13/209,645.69 = 39,903.69/x
  3. Step 3: Cross multiply
    139,742.13x = 209,645.69 × 39,903.69
  4. Step 4: Simplify right side
    139,742.13x = 8,365,636,424.08
  5. Step 5: Solve for x
    x = 8,365,636,424.08/139,742.13
  6. Step 6: Final answer
    x = 59,864.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.