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Finding the Fourth Proportional to 402,459.88, 555,367.78 and 221,167.91

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Solution

The fourth proportional to 402,459.88, 555,367.78 and 221,167.91 is: 305,196.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,459.88 : 555,367.78 = 221,167.91 : x
  2. Step 2: Convert to fraction form
    402,459.88/555,367.78 = 221,167.91/x
  3. Step 3: Cross multiply
    402,459.88x = 555,367.78 × 221,167.91
  4. Step 4: Simplify right side
    402,459.88x = 122,829,531,183.94
  5. Step 5: Solve for x
    x = 122,829,531,183.94/402,459.88
  6. Step 6: Final answer
    x = 305,196.96

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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.