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Finding the Fourth Proportional to 61.89, 85.40 and 35.65

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Solution

The fourth proportional to 61.89, 85.40 and 35.65 is: 49.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.89 : 85.40 = 35.65 : x
  2. Step 2: Convert to fraction form
    61.89/85.40 = 35.65/x
  3. Step 3: Cross multiply
    61.89x = 85.40 × 35.65
  4. Step 4: Simplify right side
    61.89x = 3,044.51
  5. Step 5: Solve for x
    x = 3,044.51/61.89
  6. Step 6: Final answer
    x = 49.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.