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Finding the Fourth Proportional to 1,180.31, 1,628.90 and 656.35

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Solution

The fourth proportional to 1,180.31, 1,628.90 and 656.35 is: 905.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.31 : 1,628.90 = 656.35 : x
  2. Step 2: Convert to fraction form
    1,180.31/1,628.90 = 656.35/x
  3. Step 3: Cross multiply
    1,180.31x = 1,628.90 × 656.35
  4. Step 4: Simplify right side
    1,180.31x = 1,069,126.08
  5. Step 5: Solve for x
    x = 1,069,126.08/1,180.31
  6. Step 6: Final answer
    x = 905.80

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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.