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Finding the Fourth Proportional to 85,128.60, 127,692.90 and 54,101.40

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Solution

The fourth proportional to 85,128.60, 127,692.90 and 54,101.40 is: 81,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,128.60 : 127,692.90 = 54,101.40 : x
  2. Step 2: Convert to fraction form
    85,128.60/127,692.90 = 54,101.40/x
  3. Step 3: Cross multiply
    85,128.60x = 127,692.90 × 54,101.40
  4. Step 4: Simplify right side
    85,128.60x = 6,908,364,660.06
  5. Step 5: Solve for x
    x = 6,908,364,660.06/85,128.60
  6. Step 6: Final answer
    x = 81,152.10

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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.