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Finding the Fourth Proportional to 84,762.72, 127,141.92 and 40,420.80

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Solution

The fourth proportional to 84,762.72, 127,141.92 and 40,420.80 is: 60,630.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,762.72 : 127,141.92 = 40,420.80 : x
  2. Step 2: Convert to fraction form
    84,762.72/127,141.92 = 40,420.80/x
  3. Step 3: Cross multiply
    84,762.72x = 127,141.92 × 40,420.80
  4. Step 4: Simplify right side
    84,762.72x = 5,139,178,119.94
  5. Step 5: Solve for x
    x = 5,139,178,119.94/84,762.72
  6. Step 6: Final answer
    x = 60,630.17

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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.