Home / 1,421.29-2,131.20-651.13

Finding the Fourth Proportional to 1,421.29, 2,131.20 and 651.13

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Solution

The fourth proportional to 1,421.29, 2,131.20 and 651.13 is: 976.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.29 : 2,131.20 = 651.13 : x
  2. Step 2: Convert to fraction form
    1,421.29/2,131.20 = 651.13/x
  3. Step 3: Cross multiply
    1,421.29x = 2,131.20 × 651.13
  4. Step 4: Simplify right side
    1,421.29x = 1,387,688.26
  5. Step 5: Solve for x
    x = 1,387,688.26/1,421.29
  6. Step 6: Final answer
    x = 976.36

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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.