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Finding the Fourth Proportional to 1,392.89, 1,921.64 and 803.07

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Solution

The fourth proportional to 1,392.89, 1,921.64 and 803.07 is: 1,107.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.89 : 1,921.64 = 803.07 : x
  2. Step 2: Convert to fraction form
    1,392.89/1,921.64 = 803.07/x
  3. Step 3: Cross multiply
    1,392.89x = 1,921.64 × 803.07
  4. Step 4: Simplify right side
    1,392.89x = 1,543,207.42
  5. Step 5: Solve for x
    x = 1,543,207.42/1,392.89
  6. Step 6: Final answer
    x = 1,107.92

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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.