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Finding the Fourth Proportional to 302.38, 416.40 and 260.80

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Solution

The fourth proportional to 302.38, 416.40 and 260.80 is: 359.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.38 : 416.40 = 260.80 : x
  2. Step 2: Convert to fraction form
    302.38/416.40 = 260.80/x
  3. Step 3: Cross multiply
    302.38x = 416.40 × 260.80
  4. Step 4: Simplify right side
    302.38x = 108,597.12
  5. Step 5: Solve for x
    x = 108,597.12/302.38
  6. Step 6: Final answer
    x = 359.14

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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.