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Finding the Fourth Proportional to 316.77, 436.45 and 242.85

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Solution

The fourth proportional to 316.77, 436.45 and 242.85 is: 334.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.77 : 436.45 = 242.85 : x
  2. Step 2: Convert to fraction form
    316.77/436.45 = 242.85/x
  3. Step 3: Cross multiply
    316.77x = 436.45 × 242.85
  4. Step 4: Simplify right side
    316.77x = 105,991.88
  5. Step 5: Solve for x
    x = 105,991.88/316.77
  6. Step 6: Final answer
    x = 334.60

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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.