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Finding the Fourth Proportional to 85,936.60, 128,904.90 and 85,936.60

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Solution

The fourth proportional to 85,936.60, 128,904.90 and 85,936.60 is: 128,904.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,936.60 : 128,904.90 = 85,936.60 : x
  2. Step 2: Convert to fraction form
    85,936.60/128,904.90 = 85,936.60/x
  3. Step 3: Cross multiply
    85,936.60x = 128,904.90 × 85,936.60
  4. Step 4: Simplify right side
    85,936.60x = 11,077,648,829.34
  5. Step 5: Solve for x
    x = 11,077,648,829.34/85,936.60
  6. Step 6: Final answer
    x = 128,904.90

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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.