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Finding the Fourth Proportional to 85,786.78, 128,537.90 and 60,702.50

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Solution

The fourth proportional to 85,786.78, 128,537.90 and 60,702.50 is: 90,953.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,786.78 : 128,537.90 = 60,702.50 : x
  2. Step 2: Convert to fraction form
    85,786.78/128,537.90 = 60,702.50/x
  3. Step 3: Cross multiply
    85,786.78x = 128,537.90 × 60,702.50
  4. Step 4: Simplify right side
    85,786.78x = 7,802,571,874.75
  5. Step 5: Solve for x
    x = 7,802,571,874.75/85,786.78
  6. Step 6: Final answer
    x = 90,953.08

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.