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Finding the Fourth Proportional to 1,428.58, 1,971.30 and 839.26

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Solution

The fourth proportional to 1,428.58, 1,971.30 and 839.26 is: 1,158.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.58 : 1,971.30 = 839.26 : x
  2. Step 2: Convert to fraction form
    1,428.58/1,971.30 = 839.26/x
  3. Step 3: Cross multiply
    1,428.58x = 1,971.30 × 839.26
  4. Step 4: Simplify right side
    1,428.58x = 1,654,433.24
  5. Step 5: Solve for x
    x = 1,654,433.24/1,428.58
  6. Step 6: Final answer
    x = 1,158.10

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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.