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Finding the Fourth Proportional to 79,305.40, 118,739.40 and 61,809.40

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Solution

The fourth proportional to 79,305.40, 118,739.40 and 61,809.40 is: 92,543.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,305.40 : 118,739.40 = 61,809.40 : x
  2. Step 2: Convert to fraction form
    79,305.40/118,739.40 = 61,809.40/x
  3. Step 3: Cross multiply
    79,305.40x = 118,739.40 × 61,809.40
  4. Step 4: Simplify right side
    79,305.40x = 7,339,211,070.36
  5. Step 5: Solve for x
    x = 7,339,211,070.36/79,305.40
  6. Step 6: Final answer
    x = 92,543.65

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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.