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Finding the Fourth Proportional to 1,421.32, 2,130.78 and 763

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Solution

The fourth proportional to 1,421.32, 2,130.78 and 763 is: 1,143.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.32 : 2,130.78 = 763 : x
  2. Step 2: Convert to fraction form
    1,421.32/2,130.78 = 763/x
  3. Step 3: Cross multiply
    1,421.32x = 2,130.78 × 763
  4. Step 4: Simplify right side
    1,421.32x = 1,625,785.14
  5. Step 5: Solve for x
    x = 1,625,785.14/1,421.32
  6. Step 6: Final answer
    x = 1,143.86

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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.