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Finding the Fourth Proportional to 403,012.67, 556,157.52 and 221,720.72

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Solution

The fourth proportional to 403,012.67, 556,157.52 and 221,720.72 is: 305,974.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,012.67 : 556,157.52 = 221,720.72 : x
  2. Step 2: Convert to fraction form
    403,012.67/556,157.52 = 221,720.72/x
  3. Step 3: Cross multiply
    403,012.67x = 556,157.52 × 221,720.72
  4. Step 4: Simplify right side
    403,012.67x = 123,311,642,987.03
  5. Step 5: Solve for x
    x = 123,311,642,987.03/403,012.67
  6. Step 6: Final answer
    x = 305,974.61

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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.