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Finding the Fourth Proportional to 689.51, 1,034.53 and 415.79

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Solution

The fourth proportional to 689.51, 1,034.53 and 415.79 is: 623.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.51 : 1,034.53 = 415.79 : x
  2. Step 2: Convert to fraction form
    689.51/1,034.53 = 415.79/x
  3. Step 3: Cross multiply
    689.51x = 1,034.53 × 415.79
  4. Step 4: Simplify right side
    689.51x = 430,147.23
  5. Step 5: Solve for x
    x = 430,147.23/689.51
  6. Step 6: Final answer
    x = 623.84

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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.