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Finding the Fourth Proportional to 1,128.31, 1,693.71 and 470.66

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Solution

The fourth proportional to 1,128.31, 1,693.71 and 470.66 is: 706.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.31 : 1,693.71 = 470.66 : x
  2. Step 2: Convert to fraction form
    1,128.31/1,693.71 = 470.66/x
  3. Step 3: Cross multiply
    1,128.31x = 1,693.71 × 470.66
  4. Step 4: Simplify right side
    1,128.31x = 797,161.55
  5. Step 5: Solve for x
    x = 797,161.55/1,128.31
  6. Step 6: Final answer
    x = 706.51

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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.