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Finding the Fourth Proportional to 85,658.20, 128,487.30 and 57,664.60

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Solution

The fourth proportional to 85,658.20, 128,487.30 and 57,664.60 is: 86,496.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,658.20 : 128,487.30 = 57,664.60 : x
  2. Step 2: Convert to fraction form
    85,658.20/128,487.30 = 57,664.60/x
  3. Step 3: Cross multiply
    85,658.20x = 128,487.30 × 57,664.60
  4. Step 4: Simplify right side
    85,658.20x = 7,409,168,759.58
  5. Step 5: Solve for x
    x = 7,409,168,759.58/85,658.20
  6. Step 6: Final answer
    x = 86,496.90

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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.