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Finding the Fourth Proportional to 402,656.88, 555,666.84 and 221,380.50

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Solution

The fourth proportional to 402,656.88, 555,666.84 and 221,380.50 is: 305,505.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,656.88 : 555,666.84 = 221,380.50 : x
  2. Step 2: Convert to fraction form
    402,656.88/555,666.84 = 221,380.50/x
  3. Step 3: Cross multiply
    402,656.88x = 555,666.84 × 221,380.50
  4. Step 4: Simplify right side
    402,656.88x = 123,013,802,872.62
  5. Step 5: Solve for x
    x = 123,013,802,872.62/402,656.88
  6. Step 6: Final answer
    x = 305,505.28

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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.