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Finding the Fourth Proportional to 1,680.64, 2,320 and 1,128.96

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Solution

The fourth proportional to 1,680.64, 2,320 and 1,128.96 is: 1,558.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.64 : 2,320 = 1,128.96 : x
  2. Step 2: Convert to fraction form
    1,680.64/2,320 = 1,128.96/x
  3. Step 3: Cross multiply
    1,680.64x = 2,320 × 1,128.96
  4. Step 4: Simplify right side
    1,680.64x = 2,619,187.20
  5. Step 5: Solve for x
    x = 2,619,187.20/1,680.64
  6. Step 6: Final answer
    x = 1,558.45

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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.