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Finding the Fourth Proportional to 1,428.62, 1,971.76 and 839.16

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Solution

The fourth proportional to 1,428.62, 1,971.76 and 839.16 is: 1,158.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.62 : 1,971.76 = 839.16 : x
  2. Step 2: Convert to fraction form
    1,428.62/1,971.76 = 839.16/x
  3. Step 3: Cross multiply
    1,428.62x = 1,971.76 × 839.16
  4. Step 4: Simplify right side
    1,428.62x = 1,654,618.06
  5. Step 5: Solve for x
    x = 1,654,618.06/1,428.62
  6. Step 6: Final answer
    x = 1,158.19

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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.