Home / 121,106.31-167,032.04-78,678.51

Finding the Fourth Proportional to 121,106.31, 167,032.04 and 78,678.51

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Solution

The fourth proportional to 121,106.31, 167,032.04 and 78,678.51 is: 108,514.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,106.31 : 167,032.04 = 78,678.51 : x
  2. Step 2: Convert to fraction form
    121,106.31/167,032.04 = 78,678.51/x
  3. Step 3: Cross multiply
    121,106.31x = 167,032.04 × 78,678.51
  4. Step 4: Simplify right side
    121,106.31x = 13,141,831,636.07
  5. Step 5: Solve for x
    x = 13,141,831,636.07/121,106.31
  6. Step 6: Final answer
    x = 108,514.84

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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.