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Finding the Fourth Proportional to 403,012.88, 556,157.75 and 221,720.91

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Solution

The fourth proportional to 403,012.88, 556,157.75 and 221,720.91 is: 305,974.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,012.88 : 556,157.75 = 221,720.91 : x
  2. Step 2: Convert to fraction form
    403,012.88/556,157.75 = 221,720.91/x
  3. Step 3: Cross multiply
    403,012.88x = 556,157.75 × 221,720.91
  4. Step 4: Simplify right side
    403,012.88x = 123,311,801,324.95
  5. Step 5: Solve for x
    x = 123,311,801,324.95/403,012.88
  6. Step 6: Final answer
    x = 305,974.84

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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.