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Finding the Fourth Proportional to 1,402.31, 1,935.55 and 813.19

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Solution

The fourth proportional to 1,402.31, 1,935.55 and 813.19 is: 1,122.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.31 : 1,935.55 = 813.19 : x
  2. Step 2: Convert to fraction form
    1,402.31/1,935.55 = 813.19/x
  3. Step 3: Cross multiply
    1,402.31x = 1,935.55 × 813.19
  4. Step 4: Simplify right side
    1,402.31x = 1,573,965.14
  5. Step 5: Solve for x
    x = 1,573,965.14/1,402.31
  6. Step 6: Final answer
    x = 1,122.41

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1.5x scale

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.