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Finding the Fourth Proportional to 478.40, 717.60 and 332.60

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Solution

The fourth proportional to 478.40, 717.60 and 332.60 is: 498.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.40 : 717.60 = 332.60 : x
  2. Step 2: Convert to fraction form
    478.40/717.60 = 332.60/x
  3. Step 3: Cross multiply
    478.40x = 717.60 × 332.60
  4. Step 4: Simplify right side
    478.40x = 238,673.76
  5. Step 5: Solve for x
    x = 238,673.76/478.40
  6. Step 6: Final answer
    x = 498.90

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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.