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Finding the Fourth Proportional to 85,307.70, 127,961.55 and 40,911.60

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Solution

The fourth proportional to 85,307.70, 127,961.55 and 40,911.60 is: 61,367.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,307.70 : 127,961.55 = 40,911.60 : x
  2. Step 2: Convert to fraction form
    85,307.70/127,961.55 = 40,911.60/x
  3. Step 3: Cross multiply
    85,307.70x = 127,961.55 × 40,911.60
  4. Step 4: Simplify right side
    85,307.70x = 5,235,111,748.98
  5. Step 5: Solve for x
    x = 5,235,111,748.98/85,307.70
  6. Step 6: Final answer
    x = 61,367.40

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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.