Home / 1,428.47-2,131.18-1,272.65

Finding the Fourth Proportional to 1,428.47, 2,131.18 and 1,272.65

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Solution

The fourth proportional to 1,428.47, 2,131.18 and 1,272.65 is: 1,898.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.47 : 2,131.18 = 1,272.65 : x
  2. Step 2: Convert to fraction form
    1,428.47/2,131.18 = 1,272.65/x
  3. Step 3: Cross multiply
    1,428.47x = 2,131.18 × 1,272.65
  4. Step 4: Simplify right side
    1,428.47x = 2,712,232.39
  5. Step 5: Solve for x
    x = 2,712,232.39/1,428.47
  6. Step 6: Final answer
    x = 1,898.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.