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Finding the Fourth Proportional to 403,031.32, 556,183.20 and 221,739.40

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Solution

The fourth proportional to 403,031.32, 556,183.20 and 221,739.40 is: 306,000.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,031.32 : 556,183.20 = 221,739.40 : x
  2. Step 2: Convert to fraction form
    403,031.32/556,183.20 = 221,739.40/x
  3. Step 3: Cross multiply
    403,031.32x = 556,183.20 × 221,739.40
  4. Step 4: Simplify right side
    403,031.32x = 123,327,729,058.08
  5. Step 5: Solve for x
    x = 123,327,729,058.08/403,031.32
  6. Step 6: Final answer
    x = 306,000.36

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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.