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Finding the Fourth Proportional to 76,797.70, 105,980.58 and 42,805.80

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Solution

The fourth proportional to 76,797.70, 105,980.58 and 42,805.80 is: 59,071.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,797.70 : 105,980.58 = 42,805.80 : x
  2. Step 2: Convert to fraction form
    76,797.70/105,980.58 = 42,805.80/x
  3. Step 3: Cross multiply
    76,797.70x = 105,980.58 × 42,805.80
  4. Step 4: Simplify right side
    76,797.70x = 4,536,583,511.36
  5. Step 5: Solve for x
    x = 4,536,583,511.36/76,797.70
  6. Step 6: Final answer
    x = 59,071.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.