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Finding the Fourth Proportional to 85,420.60, 128,130.90 and 80,827.90

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Solution

The fourth proportional to 85,420.60, 128,130.90 and 80,827.90 is: 121,241.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,420.60 : 128,130.90 = 80,827.90 : x
  2. Step 2: Convert to fraction form
    85,420.60/128,130.90 = 80,827.90/x
  3. Step 3: Cross multiply
    85,420.60x = 128,130.90 × 80,827.90
  4. Step 4: Simplify right side
    85,420.60x = 10,356,551,572.11
  5. Step 5: Solve for x
    x = 10,356,551,572.11/85,420.60
  6. Step 6: Final answer
    x = 121,241.85

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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.