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Finding the Fourth Proportional to 478.89, 718.34 and 316.54

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Solution

The fourth proportional to 478.89, 718.34 and 316.54 is: 474.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.89 : 718.34 = 316.54 : x
  2. Step 2: Convert to fraction form
    478.89/718.34 = 316.54/x
  3. Step 3: Cross multiply
    478.89x = 718.34 × 316.54
  4. Step 4: Simplify right side
    478.89x = 227,378.17
  5. Step 5: Solve for x
    x = 227,378.17/478.89
  6. Step 6: Final answer
    x = 474.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.