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Finding the Fourth Proportional to 78,721.99, 118,039.65 and 53,790.19

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Solution

The fourth proportional to 78,721.99, 118,039.65 and 53,790.19 is: 80,655.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.99 : 118,039.65 = 53,790.19 : x
  2. Step 2: Convert to fraction form
    78,721.99/118,039.65 = 53,790.19/x
  3. Step 3: Cross multiply
    78,721.99x = 118,039.65 × 53,790.19
  4. Step 4: Simplify right side
    78,721.99x = 6,349,374,704.22
  5. Step 5: Solve for x
    x = 6,349,374,704.22/78,721.99
  6. Step 6: Final answer
    x = 80,655.67

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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.