Home / 1,421.21-2,129.63-763.16

Finding the Fourth Proportional to 1,421.21, 2,129.63 and 763.16

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Solution

The fourth proportional to 1,421.21, 2,129.63 and 763.16 is: 1,143.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.21 : 2,129.63 = 763.16 : x
  2. Step 2: Convert to fraction form
    1,421.21/2,129.63 = 763.16/x
  3. Step 3: Cross multiply
    1,421.21x = 2,129.63 × 763.16
  4. Step 4: Simplify right side
    1,421.21x = 1,625,233.97
  5. Step 5: Solve for x
    x = 1,625,233.97/1,421.21
  6. Step 6: Final answer
    x = 1,143.55

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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.