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Finding the Fourth Proportional to 90,978.39, 136,301.33 and 65,956.38

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Solution

The fourth proportional to 90,978.39, 136,301.33 and 65,956.38 is: 98,814.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.39 : 136,301.33 = 65,956.38 : x
  2. Step 2: Convert to fraction form
    90,978.39/136,301.33 = 65,956.38/x
  3. Step 3: Cross multiply
    90,978.39x = 136,301.33 × 65,956.38
  4. Step 4: Simplify right side
    90,978.39x = 8,989,941,969.75
  5. Step 5: Solve for x
    x = 8,989,941,969.75/90,978.39
  6. Step 6: Final answer
    x = 98,814.04

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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.