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Finding the Fourth Proportional to 1,421.39, 2,132.09 and 555.09

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Solution

The fourth proportional to 1,421.39, 2,132.09 and 555.09 is: 832.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.39 : 2,132.09 = 555.09 : x
  2. Step 2: Convert to fraction form
    1,421.39/2,132.09 = 555.09/x
  3. Step 3: Cross multiply
    1,421.39x = 2,132.09 × 555.09
  4. Step 4: Simplify right side
    1,421.39x = 1,183,507.06
  5. Step 5: Solve for x
    x = 1,183,507.06/1,421.39
  6. Step 6: Final answer
    x = 832.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.