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Finding the Fourth Proportional to 1,021.23, 1,406.84 and 958.59

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Solution

The fourth proportional to 1,021.23, 1,406.84 and 958.59 is: 1,320.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.23 : 1,406.84 = 958.59 : x
  2. Step 2: Convert to fraction form
    1,021.23/1,406.84 = 958.59/x
  3. Step 3: Cross multiply
    1,021.23x = 1,406.84 × 958.59
  4. Step 4: Simplify right side
    1,021.23x = 1,348,577.96
  5. Step 5: Solve for x
    x = 1,348,577.96/1,021.23
  6. Step 6: Final answer
    x = 1,320.54

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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.