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Finding the Fourth Proportional to 85,761.75, 128,686.50 and 40,833.93

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Solution

The fourth proportional to 85,761.75, 128,686.50 and 40,833.93 is: 61,271.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,761.75 : 128,686.50 = 40,833.93 : x
  2. Step 2: Convert to fraction form
    85,761.75/128,686.50 = 40,833.93/x
  3. Step 3: Cross multiply
    85,761.75x = 128,686.50 × 40,833.93
  4. Step 4: Simplify right side
    85,761.75x = 5,254,775,532.95
  5. Step 5: Solve for x
    x = 5,254,775,532.95/85,761.75
  6. Step 6: Final answer
    x = 61,271.79

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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.