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Finding the Fourth Proportional to 66,509.55, 91,783.13 and 38,215.17

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Solution

The fourth proportional to 66,509.55, 91,783.13 and 38,215.17 is: 52,736.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,509.55 : 91,783.13 = 38,215.17 : x
  2. Step 2: Convert to fraction form
    66,509.55/91,783.13 = 38,215.17/x
  3. Step 3: Cross multiply
    66,509.55x = 91,783.13 × 38,215.17
  4. Step 4: Simplify right side
    66,509.55x = 3,507,507,916.08
  5. Step 5: Solve for x
    x = 3,507,507,916.08/66,509.55
  6. Step 6: Final answer
    x = 52,736.91

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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.