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Finding the Fourth Proportional to 121,762.71, 167,973.89 and 76,418.28

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Solution

The fourth proportional to 121,762.71, 167,973.89 and 76,418.28 is: 105,420.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,762.71 : 167,973.89 = 76,418.28 : x
  2. Step 2: Convert to fraction form
    121,762.71/167,973.89 = 76,418.28/x
  3. Step 3: Cross multiply
    121,762.71x = 167,973.89 × 76,418.28
  4. Step 4: Simplify right side
    121,762.71x = 12,836,275,376.62
  5. Step 5: Solve for x
    x = 12,836,275,376.62/121,762.71
  6. Step 6: Final answer
    x = 105,420.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.