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Finding the Fourth Proportional to 1,402.80, 1,935.64 and 813.28

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Solution

The fourth proportional to 1,402.80, 1,935.64 and 813.28 is: 1,122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.80 : 1,935.64 = 813.28 : x
  2. Step 2: Convert to fraction form
    1,402.80/1,935.64 = 813.28/x
  3. Step 3: Cross multiply
    1,402.80x = 1,935.64 × 813.28
  4. Step 4: Simplify right side
    1,402.80x = 1,574,217.30
  5. Step 5: Solve for x
    x = 1,574,217.30/1,402.80
  6. Step 6: Final answer
    x = 1,122.20

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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.