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Finding the Fourth Proportional to 76,666.80, 115,005.60 and 43,402.80

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Solution

The fourth proportional to 76,666.80, 115,005.60 and 43,402.80 is: 65,107.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,666.80 : 115,005.60 = 43,402.80 : x
  2. Step 2: Convert to fraction form
    76,666.80/115,005.60 = 43,402.80/x
  3. Step 3: Cross multiply
    76,666.80x = 115,005.60 × 43,402.80
  4. Step 4: Simplify right side
    76,666.80x = 4,991,565,055.68
  5. Step 5: Solve for x
    x = 4,991,565,055.68/76,666.80
  6. Step 6: Final answer
    x = 65,107.26

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1.5x scale

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.