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Finding the Fourth Proportional to 90,692.80, 136,039.20 and 85,881.40

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Solution

The fourth proportional to 90,692.80, 136,039.20 and 85,881.40 is: 128,822.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,692.80 : 136,039.20 = 85,881.40 : x
  2. Step 2: Convert to fraction form
    90,692.80/136,039.20 = 85,881.40/x
  3. Step 3: Cross multiply
    90,692.80x = 136,039.20 × 85,881.40
  4. Step 4: Simplify right side
    90,692.80x = 11,683,236,950.88
  5. Step 5: Solve for x
    x = 11,683,236,950.88/90,692.80
  6. Step 6: Final answer
    x = 128,822.10

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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.