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Finding the Fourth Proportional to 1,421.39, 2,132.64 and 641.18

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Solution

The fourth proportional to 1,421.39, 2,132.64 and 641.18 is: 962.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.39 : 2,132.64 = 641.18 : x
  2. Step 2: Convert to fraction form
    1,421.39/2,132.64 = 641.18/x
  3. Step 3: Cross multiply
    1,421.39x = 2,132.64 × 641.18
  4. Step 4: Simplify right side
    1,421.39x = 1,367,406.12
  5. Step 5: Solve for x
    x = 1,367,406.12/1,421.39
  6. Step 6: Final answer
    x = 962.02

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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.