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Finding the Fourth Proportional to 79,768.80, 109,382.40 and 76,852.80

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Solution

The fourth proportional to 79,768.80, 109,382.40 and 76,852.80 is: 105,383.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,768.80 : 109,382.40 = 76,852.80 : x
  2. Step 2: Convert to fraction form
    79,768.80/109,382.40 = 76,852.80/x
  3. Step 3: Cross multiply
    79,768.80x = 109,382.40 × 76,852.80
  4. Step 4: Simplify right side
    79,768.80x = 8,406,343,710.72
  5. Step 5: Solve for x
    x = 8,406,343,710.72/79,768.80
  6. Step 6: Final answer
    x = 105,383.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.