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Finding the Fourth Proportional to 1,628.64, 2,443.60 and 716

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Solution

The fourth proportional to 1,628.64, 2,443.60 and 716 is: 1,074.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.64 : 2,443.60 = 716 : x
  2. Step 2: Convert to fraction form
    1,628.64/2,443.60 = 716/x
  3. Step 3: Cross multiply
    1,628.64x = 2,443.60 × 716
  4. Step 4: Simplify right side
    1,628.64x = 1,749,617.60
  5. Step 5: Solve for x
    x = 1,749,617.60/1,628.64
  6. Step 6: Final answer
    x = 1,074.28

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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.