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Finding the Fourth Proportional to 1,402.05, 1,935.28 and 842.95

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Solution

The fourth proportional to 1,402.05, 1,935.28 and 842.95 is: 1,163.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.05 : 1,935.28 = 842.95 : x
  2. Step 2: Convert to fraction form
    1,402.05/1,935.28 = 842.95/x
  3. Step 3: Cross multiply
    1,402.05x = 1,935.28 × 842.95
  4. Step 4: Simplify right side
    1,402.05x = 1,631,330.38
  5. Step 5: Solve for x
    x = 1,631,330.38/1,402.05
  6. Step 6: Final answer
    x = 1,163.53

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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.