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Finding the Fourth Proportional to 85,812.90, 128,719.35 and 57,746.40

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Solution

The fourth proportional to 85,812.90, 128,719.35 and 57,746.40 is: 86,619.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.90 : 128,719.35 = 57,746.40 : x
  2. Step 2: Convert to fraction form
    85,812.90/128,719.35 = 57,746.40/x
  3. Step 3: Cross multiply
    85,812.90x = 128,719.35 × 57,746.40
  4. Step 4: Simplify right side
    85,812.90x = 7,433,079,072.84
  5. Step 5: Solve for x
    x = 7,433,079,072.84/85,812.90
  6. Step 6: Final answer
    x = 86,619.60

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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.