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Finding the Fourth Proportional to 85,978.80, 128,773.80 and 50,986.80

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Solution

The fourth proportional to 85,978.80, 128,773.80 and 50,986.80 is: 76,364.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.80 : 128,773.80 = 50,986.80 : x
  2. Step 2: Convert to fraction form
    85,978.80/128,773.80 = 50,986.80/x
  3. Step 3: Cross multiply
    85,978.80x = 128,773.80 × 50,986.80
  4. Step 4: Simplify right side
    85,978.80x = 6,565,763,985.84
  5. Step 5: Solve for x
    x = 6,565,763,985.84/85,978.80
  6. Step 6: Final answer
    x = 76,364.92

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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.