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Finding the Fourth Proportional to 316.50, 436.75 and 307.18

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Solution

The fourth proportional to 316.50, 436.75 and 307.18 is: 423.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.50 : 436.75 = 307.18 : x
  2. Step 2: Convert to fraction form
    316.50/436.75 = 307.18/x
  3. Step 3: Cross multiply
    316.50x = 436.75 × 307.18
  4. Step 4: Simplify right side
    316.50x = 134,160.87
  5. Step 5: Solve for x
    x = 134,160.87/316.50
  6. Step 6: Final answer
    x = 423.89

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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.