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Finding the Fourth Proportional to 1,128.96, 1,693.31 and 479.21

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Solution

The fourth proportional to 1,128.96, 1,693.31 and 479.21 is: 718.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.96 : 1,693.31 = 479.21 : x
  2. Step 2: Convert to fraction form
    1,128.96/1,693.31 = 479.21/x
  3. Step 3: Cross multiply
    1,128.96x = 1,693.31 × 479.21
  4. Step 4: Simplify right side
    1,128.96x = 811,440.22
  5. Step 5: Solve for x
    x = 811,440.22/1,128.96
  6. Step 6: Final answer
    x = 718.75

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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.