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Finding the Fourth Proportional to 1,402.66, 1,936.08 and 813.58

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Solution

The fourth proportional to 1,402.66, 1,936.08 and 813.58 is: 1,122.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.66 : 1,936.08 = 813.58 : x
  2. Step 2: Convert to fraction form
    1,402.66/1,936.08 = 813.58/x
  3. Step 3: Cross multiply
    1,402.66x = 1,936.08 × 813.58
  4. Step 4: Simplify right side
    1,402.66x = 1,575,155.97
  5. Step 5: Solve for x
    x = 1,575,155.97/1,402.66
  6. Step 6: Final answer
    x = 1,122.98

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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.