Home / 85,933.80-128,536.20-77,112.90

Finding the Fourth Proportional to 85,933.80, 128,536.20 and 77,112.90

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Solution

The fourth proportional to 85,933.80, 128,536.20 and 77,112.90 is: 115,342.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,933.80 : 128,536.20 = 77,112.90 : x
  2. Step 2: Convert to fraction form
    85,933.80/128,536.20 = 77,112.90/x
  3. Step 3: Cross multiply
    85,933.80x = 128,536.20 × 77,112.90
  4. Step 4: Simplify right side
    85,933.80x = 9,911,799,136.98
  5. Step 5: Solve for x
    x = 9,911,799,136.98/85,933.80
  6. Step 6: Final answer
    x = 115,342.27

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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.