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Finding the Fourth Proportional to 85,883.94, 128,809.49 and 26,720.33

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Solution

The fourth proportional to 85,883.94, 128,809.49 and 26,720.33 is: 40,075.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,883.94 : 128,809.49 = 26,720.33 : x
  2. Step 2: Convert to fraction form
    85,883.94/128,809.49 = 26,720.33/x
  3. Step 3: Cross multiply
    85,883.94x = 128,809.49 × 26,720.33
  4. Step 4: Simplify right side
    85,883.94x = 3,441,831,302.28
  5. Step 5: Solve for x
    x = 3,441,831,302.28/85,883.94
  6. Step 6: Final answer
    x = 40,075.38

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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.