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Finding the Fourth Proportional to 1,428.99, 1,972.25 and 839.55

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Solution

The fourth proportional to 1,428.99, 1,972.25 and 839.55 is: 1,158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.99 : 1,972.25 = 839.55 : x
  2. Step 2: Convert to fraction form
    1,428.99/1,972.25 = 839.55/x
  3. Step 3: Cross multiply
    1,428.99x = 1,972.25 × 839.55
  4. Step 4: Simplify right side
    1,428.99x = 1,655,802.49
  5. Step 5: Solve for x
    x = 1,655,802.49/1,428.99
  6. Step 6: Final answer
    x = 1,158.72

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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.