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Finding the Fourth Proportional to 492.50, 679.66 and 317.88

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Solution

The fourth proportional to 492.50, 679.66 and 317.88 is: 438.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.50 : 679.66 = 317.88 : x
  2. Step 2: Convert to fraction form
    492.50/679.66 = 317.88/x
  3. Step 3: Cross multiply
    492.50x = 679.66 × 317.88
  4. Step 4: Simplify right side
    492.50x = 216,050.32
  5. Step 5: Solve for x
    x = 216,050.32/492.50
  6. Step 6: Final answer
    x = 438.68

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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.