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Finding the Fourth Proportional to 1,021.31, 1,409.43 and 573.16

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Solution

The fourth proportional to 1,021.31, 1,409.43 and 573.16 is: 790.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.31 : 1,409.43 = 573.16 : x
  2. Step 2: Convert to fraction form
    1,021.31/1,409.43 = 573.16/x
  3. Step 3: Cross multiply
    1,021.31x = 1,409.43 × 573.16
  4. Step 4: Simplify right side
    1,021.31x = 807,818.99
  5. Step 5: Solve for x
    x = 807,818.99/1,021.31
  6. Step 6: Final answer
    x = 790.97

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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.