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Finding the Fourth Proportional to 753.36, 1,128.50 and 698.68

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Solution

The fourth proportional to 753.36, 1,128.50 and 698.68 is: 1,046.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.36 : 1,128.50 = 698.68 : x
  2. Step 2: Convert to fraction form
    753.36/1,128.50 = 698.68/x
  3. Step 3: Cross multiply
    753.36x = 1,128.50 × 698.68
  4. Step 4: Simplify right side
    753.36x = 788,460.38
  5. Step 5: Solve for x
    x = 788,460.38/753.36
  6. Step 6: Final answer
    x = 1,046.59

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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.