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Finding the Fourth Proportional to 460.25, 690.40 and 135.65

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Solution

The fourth proportional to 460.25, 690.40 and 135.65 is: 203.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.25 : 690.40 = 135.65 : x
  2. Step 2: Convert to fraction form
    460.25/690.40 = 135.65/x
  3. Step 3: Cross multiply
    460.25x = 690.40 × 135.65
  4. Step 4: Simplify right side
    460.25x = 93,648.63
  5. Step 5: Solve for x
    x = 93,648.63/460.25
  6. Step 6: Final answer
    x = 203.47

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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.