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Finding the Fourth Proportional to 139,632.81, 209,417.67 and 39,790.86

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Solution

The fourth proportional to 139,632.81, 209,417.67 and 39,790.86 is: 59,677.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,632.81 : 209,417.67 = 39,790.86 : x
  2. Step 2: Convert to fraction form
    139,632.81/209,417.67 = 39,790.86/x
  3. Step 3: Cross multiply
    139,632.81x = 209,417.67 × 39,790.86
  4. Step 4: Simplify right side
    139,632.81x = 8,332,909,188.50
  5. Step 5: Solve for x
    x = 8,332,909,188.50/139,632.81
  6. Step 6: Final answer
    x = 59,677.30

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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.