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Finding the Fourth Proportional to 1,393.31, 1,922.80 and 803.88

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Solution

The fourth proportional to 1,393.31, 1,922.80 and 803.88 is: 1,109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.31 : 1,922.80 = 803.88 : x
  2. Step 2: Convert to fraction form
    1,393.31/1,922.80 = 803.88/x
  3. Step 3: Cross multiply
    1,393.31x = 1,922.80 × 803.88
  4. Step 4: Simplify right side
    1,393.31x = 1,545,700.46
  5. Step 5: Solve for x
    x = 1,545,700.46/1,393.31
  6. Step 6: Final answer
    x = 1,109.37

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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.