Home / 66,021.22-91,120.93-39,178.53

Finding the Fourth Proportional to 66,021.22, 91,120.93 and 39,178.53

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Solution

The fourth proportional to 66,021.22, 91,120.93 and 39,178.53 is: 54,073.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,021.22 : 91,120.93 = 39,178.53 : x
  2. Step 2: Convert to fraction form
    66,021.22/91,120.93 = 39,178.53/x
  3. Step 3: Cross multiply
    66,021.22x = 91,120.93 × 39,178.53
  4. Step 4: Simplify right side
    66,021.22x = 3,569,984,089.63
  5. Step 5: Solve for x
    x = 3,569,984,089.63/66,021.22
  6. Step 6: Final answer
    x = 54,073.28

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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.