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Finding the Fourth Proportional to 121,906.40, 168,243.52 and 70,225.28

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Solution

The fourth proportional to 121,906.40, 168,243.52 and 70,225.28 is: 96,918.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,906.40 : 168,243.52 = 70,225.28 : x
  2. Step 2: Convert to fraction form
    121,906.40/168,243.52 = 70,225.28/x
  3. Step 3: Cross multiply
    121,906.40x = 168,243.52 × 70,225.28
  4. Step 4: Simplify right side
    121,906.40x = 11,814,948,300.19
  5. Step 5: Solve for x
    x = 11,814,948,300.19/121,906.40
  6. Step 6: Final answer
    x = 96,918.20

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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.