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Finding the Fourth Proportional to 1,128.75, 1,693.44 and 479.55

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Solution

The fourth proportional to 1,128.75, 1,693.44 and 479.55 is: 719.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.75 : 1,693.44 = 479.55 : x
  2. Step 2: Convert to fraction form
    1,128.75/1,693.44 = 479.55/x
  3. Step 3: Cross multiply
    1,128.75x = 1,693.44 × 479.55
  4. Step 4: Simplify right side
    1,128.75x = 812,089.15
  5. Step 5: Solve for x
    x = 812,089.15/1,128.75
  6. Step 6: Final answer
    x = 719.46

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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.