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Finding the Fourth Proportional to 216,698.30, 299,045.55 and 121,213.88

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Solution

The fourth proportional to 216,698.30, 299,045.55 and 121,213.88 is: 167,276.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,698.30 : 299,045.55 = 121,213.88 : x
  2. Step 2: Convert to fraction form
    216,698.30/299,045.55 = 121,213.88/x
  3. Step 3: Cross multiply
    216,698.30x = 299,045.55 × 121,213.88
  4. Step 4: Simplify right side
    216,698.30x = 36,248,469,917.01
  5. Step 5: Solve for x
    x = 36,248,469,917.01/216,698.30
  6. Step 6: Final answer
    x = 167,276.21

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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.