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Finding the Fourth Proportional to 1,129.12, 1,693.76 and 359.52

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Solution

The fourth proportional to 1,129.12, 1,693.76 and 359.52 is: 539.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.12 : 1,693.76 = 359.52 : x
  2. Step 2: Convert to fraction form
    1,129.12/1,693.76 = 359.52/x
  3. Step 3: Cross multiply
    1,129.12x = 1,693.76 × 359.52
  4. Step 4: Simplify right side
    1,129.12x = 608,940.60
  5. Step 5: Solve for x
    x = 608,940.60/1,129.12
  6. Step 6: Final answer
    x = 539.31

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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.