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Finding the Fourth Proportional to 85,368.60, 128,052.90 and 76,912.20

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Solution

The fourth proportional to 85,368.60, 128,052.90 and 76,912.20 is: 115,368.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,368.60 : 128,052.90 = 76,912.20 : x
  2. Step 2: Convert to fraction form
    85,368.60/128,052.90 = 76,912.20/x
  3. Step 3: Cross multiply
    85,368.60x = 128,052.90 × 76,912.20
  4. Step 4: Simplify right side
    85,368.60x = 9,848,830,255.38
  5. Step 5: Solve for x
    x = 9,848,830,255.38/85,368.60
  6. Step 6: Final answer
    x = 115,368.30

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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.