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Finding the Fourth Proportional to 921.65, 1,379.29 and 883.38

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Solution

The fourth proportional to 921.65, 1,379.29 and 883.38 is: 1,322.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.65 : 1,379.29 = 883.38 : x
  2. Step 2: Convert to fraction form
    921.65/1,379.29 = 883.38/x
  3. Step 3: Cross multiply
    921.65x = 1,379.29 × 883.38
  4. Step 4: Simplify right side
    921.65x = 1,218,434.99
  5. Step 5: Solve for x
    x = 1,218,434.99/921.65
  6. Step 6: Final answer
    x = 1,322.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.