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Finding the Fourth Proportional to 85,745.57, 128,655.26 and 41,405.51

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Solution

The fourth proportional to 85,745.57, 128,655.26 and 41,405.51 is: 62,126.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,745.57 : 128,655.26 = 41,405.51 : x
  2. Step 2: Convert to fraction form
    85,745.57/128,655.26 = 41,405.51/x
  3. Step 3: Cross multiply
    85,745.57x = 128,655.26 × 41,405.51
  4. Step 4: Simplify right side
    85,745.57x = 5,327,035,804.18
  5. Step 5: Solve for x
    x = 5,327,035,804.18/85,745.57
  6. Step 6: Final answer
    x = 62,126.08

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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.