Home / 1,428.23-2,143.11-648.51

Finding the Fourth Proportional to 1,428.23, 2,143.11 and 648.51

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Solution

The fourth proportional to 1,428.23, 2,143.11 and 648.51 is: 973.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.23 : 2,143.11 = 648.51 : x
  2. Step 2: Convert to fraction form
    1,428.23/2,143.11 = 648.51/x
  3. Step 3: Cross multiply
    1,428.23x = 2,143.11 × 648.51
  4. Step 4: Simplify right side
    1,428.23x = 1,389,819.01
  5. Step 5: Solve for x
    x = 1,389,819.01/1,428.23
  6. Step 6: Final answer
    x = 973.10

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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.