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Finding the Fourth Proportional to 218,728.18, 301,847.94 and 121,929.28

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Solution

The fourth proportional to 218,728.18, 301,847.94 and 121,929.28 is: 168,264.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,728.18 : 301,847.94 = 121,929.28 : x
  2. Step 2: Convert to fraction form
    218,728.18/301,847.94 = 121,929.28/x
  3. Step 3: Cross multiply
    218,728.18x = 301,847.94 × 121,929.28
  4. Step 4: Simplify right side
    218,728.18x = 36,804,101,993.68
  5. Step 5: Solve for x
    x = 36,804,101,993.68/218,728.18
  6. Step 6: Final answer
    x = 168,264.11

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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.