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Finding the Fourth Proportional to 1,403.21, 1,935.54 and 813.53

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Solution

The fourth proportional to 1,403.21, 1,935.54 and 813.53 is: 1,122.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.21 : 1,935.54 = 813.53 : x
  2. Step 2: Convert to fraction form
    1,403.21/1,935.54 = 813.53/x
  3. Step 3: Cross multiply
    1,403.21x = 1,935.54 × 813.53
  4. Step 4: Simplify right side
    1,403.21x = 1,574,610.18
  5. Step 5: Solve for x
    x = 1,574,610.18/1,403.21
  6. Step 6: Final answer
    x = 1,122.15

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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.