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Finding the Fourth Proportional to 1,085.31, 1,628.07 and 435.96

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Solution

The fourth proportional to 1,085.31, 1,628.07 and 435.96 is: 653.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.31 : 1,628.07 = 435.96 : x
  2. Step 2: Convert to fraction form
    1,085.31/1,628.07 = 435.96/x
  3. Step 3: Cross multiply
    1,085.31x = 1,628.07 × 435.96
  4. Step 4: Simplify right side
    1,085.31x = 709,773.40
  5. Step 5: Solve for x
    x = 709,773.40/1,085.31
  6. Step 6: Final answer
    x = 653.98

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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.