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Finding the Fourth Proportional to 85,639.68, 128,321.28 and 70,064.64

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Solution

The fourth proportional to 85,639.68, 128,321.28 and 70,064.64 is: 104,983.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,639.68 : 128,321.28 = 70,064.64 : x
  2. Step 2: Convert to fraction form
    85,639.68/128,321.28 = 70,064.64/x
  3. Step 3: Cross multiply
    85,639.68x = 128,321.28 × 70,064.64
  4. Step 4: Simplify right side
    85,639.68x = 8,990,784,287.54
  5. Step 5: Solve for x
    x = 8,990,784,287.54/85,639.68
  6. Step 6: Final answer
    x = 104,983.86

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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.