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Finding the Fourth Proportional to 85,784.28, 118,361.70 and 65,663.88

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Solution

The fourth proportional to 85,784.28, 118,361.70 and 65,663.88 is: 90,600.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,784.28 : 118,361.70 = 65,663.88 : x
  2. Step 2: Convert to fraction form
    85,784.28/118,361.70 = 65,663.88/x
  3. Step 3: Cross multiply
    85,784.28x = 118,361.70 × 65,663.88
  4. Step 4: Simplify right side
    85,784.28x = 7,772,088,465.40
  5. Step 5: Solve for x
    x = 7,772,088,465.40/85,784.28
  6. Step 6: Final answer
    x = 90,600.38

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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.