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Finding the Fourth Proportional to 78,661.77, 118,009.74 and 28,741.79

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Solution

The fourth proportional to 78,661.77, 118,009.74 and 28,741.79 is: 43,118.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.77 : 118,009.74 = 28,741.79 : x
  2. Step 2: Convert to fraction form
    78,661.77/118,009.74 = 28,741.79/x
  3. Step 3: Cross multiply
    78,661.77x = 118,009.74 × 28,741.79
  4. Step 4: Simplify right side
    78,661.77x = 3,391,810,574.99
  5. Step 5: Solve for x
    x = 3,391,810,574.99/78,661.77
  6. Step 6: Final answer
    x = 43,118.92

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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.