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Finding the Fourth Proportional to 85,722.40, 128,583.60 and 35,785.90

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Solution

The fourth proportional to 85,722.40, 128,583.60 and 35,785.90 is: 53,678.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,722.40 : 128,583.60 = 35,785.90 : x
  2. Step 2: Convert to fraction form
    85,722.40/128,583.60 = 35,785.90/x
  3. Step 3: Cross multiply
    85,722.40x = 128,583.60 × 35,785.90
  4. Step 4: Simplify right side
    85,722.40x = 4,601,479,851.24
  5. Step 5: Solve for x
    x = 4,601,479,851.24/85,722.40
  6. Step 6: Final answer
    x = 53,678.85

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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.