Home / 121,664.28-167,885.40-78,644.77

Finding the Fourth Proportional to 121,664.28, 167,885.40 and 78,644.77

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Solution

The fourth proportional to 121,664.28, 167,885.40 and 78,644.77 is: 108,522.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,664.28 : 167,885.40 = 78,644.77 : x
  2. Step 2: Convert to fraction form
    121,664.28/167,885.40 = 78,644.77/x
  3. Step 3: Cross multiply
    121,664.28x = 167,885.40 × 78,644.77
  4. Step 4: Simplify right side
    121,664.28x = 13,203,308,669.36
  5. Step 5: Solve for x
    x = 13,203,308,669.36/121,664.28
  6. Step 6: Final answer
    x = 108,522.48

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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.