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Finding the Fourth Proportional to 78,340.79, 117,530.62 and 36,739.19

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Solution

The fourth proportional to 78,340.79, 117,530.62 and 36,739.19 is: 55,117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,340.79 : 117,530.62 = 36,739.19 : x
  2. Step 2: Convert to fraction form
    78,340.79/117,530.62 = 36,739.19/x
  3. Step 3: Cross multiply
    78,340.79x = 117,530.62 × 36,739.19
  4. Step 4: Simplify right side
    78,340.79x = 4,317,979,779.00
  5. Step 5: Solve for x
    x = 4,317,979,779.00/78,340.79
  6. Step 6: Final answer
    x = 55,117.90

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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.