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Finding the Fourth Proportional to 90,470.90, 135,640.74 and 60,815.18

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Solution

The fourth proportional to 90,470.90, 135,640.74 and 60,815.18 is: 91,178.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,470.90 : 135,640.74 = 60,815.18 : x
  2. Step 2: Convert to fraction form
    90,470.90/135,640.74 = 60,815.18/x
  3. Step 3: Cross multiply
    90,470.90x = 135,640.74 × 60,815.18
  4. Step 4: Simplify right side
    90,470.90x = 8,249,016,018.43
  5. Step 5: Solve for x
    x = 8,249,016,018.43/90,470.90
  6. Step 6: Final answer
    x = 91,178.67

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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.