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Finding the Fourth Proportional to 85,692.52, 128,544.78 and 26,520.40

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Solution

The fourth proportional to 85,692.52, 128,544.78 and 26,520.40 is: 39,782.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,692.52 : 128,544.78 = 26,520.40 : x
  2. Step 2: Convert to fraction form
    85,692.52/128,544.78 = 26,520.40/x
  3. Step 3: Cross multiply
    85,692.52x = 128,544.78 × 26,520.40
  4. Step 4: Simplify right side
    85,692.52x = 3,409,058,983.51
  5. Step 5: Solve for x
    x = 3,409,058,983.51/85,692.52
  6. Step 6: Final answer
    x = 39,782.46

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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.