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Finding the Fourth Proportional to 1,628.80, 2,443.12 and 654.64

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Solution

The fourth proportional to 1,628.80, 2,443.12 and 654.64 is: 981.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.80 : 2,443.12 = 654.64 : x
  2. Step 2: Convert to fraction form
    1,628.80/2,443.12 = 654.64/x
  3. Step 3: Cross multiply
    1,628.80x = 2,443.12 × 654.64
  4. Step 4: Simplify right side
    1,628.80x = 1,599,364.08
  5. Step 5: Solve for x
    x = 1,599,364.08/1,628.80
  6. Step 6: Final answer
    x = 981.93

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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.