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Finding the Fourth Proportional to 93,211.80, 139,817.70 and 90,619.80

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Solution

The fourth proportional to 93,211.80, 139,817.70 and 90,619.80 is: 135,929.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,211.80 : 139,817.70 = 90,619.80 : x
  2. Step 2: Convert to fraction form
    93,211.80/139,817.70 = 90,619.80/x
  3. Step 3: Cross multiply
    93,211.80x = 139,817.70 × 90,619.80
  4. Step 4: Simplify right side
    93,211.80x = 12,670,252,010.46
  5. Step 5: Solve for x
    x = 12,670,252,010.46/93,211.80
  6. Step 6: Final answer
    x = 135,929.70

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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.