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Finding the Fourth Proportional to 77,990.70, 116,915.20 and 40,506.89

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Solution

The fourth proportional to 77,990.70, 116,915.20 and 40,506.89 is: 60,723.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,990.70 : 116,915.20 = 40,506.89 : x
  2. Step 2: Convert to fraction form
    77,990.70/116,915.20 = 40,506.89/x
  3. Step 3: Cross multiply
    77,990.70x = 116,915.20 × 40,506.89
  4. Step 4: Simplify right side
    77,990.70x = 4,735,870,459.88
  5. Step 5: Solve for x
    x = 4,735,870,459.88/77,990.70
  6. Step 6: Final answer
    x = 60,723.53

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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.