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Finding the Fourth Proportional to 105,379.21, 145,422.99 and 56,980.80

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Solution

The fourth proportional to 105,379.21, 145,422.99 and 56,980.80 is: 78,633.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,379.21 : 145,422.99 = 56,980.80 : x
  2. Step 2: Convert to fraction form
    105,379.21/145,422.99 = 56,980.80/x
  3. Step 3: Cross multiply
    105,379.21x = 145,422.99 × 56,980.80
  4. Step 4: Simplify right side
    105,379.21x = 8,286,318,308.59
  5. Step 5: Solve for x
    x = 8,286,318,308.59/105,379.21
  6. Step 6: Final answer
    x = 78,633.33

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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.