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Finding the Fourth Proportional to 85,666.40, 128,499.60 and 76,918.40

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Solution

The fourth proportional to 85,666.40, 128,499.60 and 76,918.40 is: 115,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,666.40 : 128,499.60 = 76,918.40 : x
  2. Step 2: Convert to fraction form
    85,666.40/128,499.60 = 76,918.40/x
  3. Step 3: Cross multiply
    85,666.40x = 128,499.60 × 76,918.40
  4. Step 4: Simplify right side
    85,666.40x = 9,883,983,632.64
  5. Step 5: Solve for x
    x = 9,883,983,632.64/85,666.40
  6. Step 6: Final answer
    x = 115,377.60

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Similar ratio
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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.