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Finding the Fourth Proportional to 316.70, 436.68 and 242.90

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Solution

The fourth proportional to 316.70, 436.68 and 242.90 is: 334.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.70 : 436.68 = 242.90 : x
  2. Step 2: Convert to fraction form
    316.70/436.68 = 242.90/x
  3. Step 3: Cross multiply
    316.70x = 436.68 × 242.90
  4. Step 4: Simplify right side
    316.70x = 106,069.57
  5. Step 5: Solve for x
    x = 106,069.57/316.70
  6. Step 6: Final answer
    x = 334.92

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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.