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Finding the Fourth Proportional to 675.51, 1,010.85 and 415.56

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Solution

The fourth proportional to 675.51, 1,010.85 and 415.56 is: 621.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.51 : 1,010.85 = 415.56 : x
  2. Step 2: Convert to fraction form
    675.51/1,010.85 = 415.56/x
  3. Step 3: Cross multiply
    675.51x = 1,010.85 × 415.56
  4. Step 4: Simplify right side
    675.51x = 420,071.06
  5. Step 5: Solve for x
    x = 420,071.06/675.51
  6. Step 6: Final answer
    x = 621.86

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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.