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Finding the Fourth Proportional to 1,428.21, 1,968.58 and 955.94

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Solution

The fourth proportional to 1,428.21, 1,968.58 and 955.94 is: 1,317.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.21 : 1,968.58 = 955.94 : x
  2. Step 2: Convert to fraction form
    1,428.21/1,968.58 = 955.94/x
  3. Step 3: Cross multiply
    1,428.21x = 1,968.58 × 955.94
  4. Step 4: Simplify right side
    1,428.21x = 1,881,844.37
  5. Step 5: Solve for x
    x = 1,881,844.37/1,428.21
  6. Step 6: Final answer
    x = 1,317.62

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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.