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Finding the Fourth Proportional to 1,428.13, 1,971.38 and 896.87

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Solution

The fourth proportional to 1,428.13, 1,971.38 and 896.87 is: 1,238.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.13 : 1,971.38 = 896.87 : x
  2. Step 2: Convert to fraction form
    1,428.13/1,971.38 = 896.87/x
  3. Step 3: Cross multiply
    1,428.13x = 1,971.38 × 896.87
  4. Step 4: Simplify right side
    1,428.13x = 1,768,071.58
  5. Step 5: Solve for x
    x = 1,768,071.58/1,428.13
  6. Step 6: Final answer
    x = 1,238.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.