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Finding the Fourth Proportional to 85,776.77, 128,522.90 and 60,692.49

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Solution

The fourth proportional to 85,776.77, 128,522.90 and 60,692.49 is: 90,938.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,776.77 : 128,522.90 = 60,692.49 : x
  2. Step 2: Convert to fraction form
    85,776.77/128,522.90 = 60,692.49/x
  3. Step 3: Cross multiply
    85,776.77x = 128,522.90 × 60,692.49
  4. Step 4: Simplify right side
    85,776.77x = 7,800,374,974.75
  5. Step 5: Solve for x
    x = 7,800,374,974.75/85,776.77
  6. Step 6: Final answer
    x = 90,938.08

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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.