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Finding the Fourth Proportional to 498.40, 747.60 and 445.60

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Solution

The fourth proportional to 498.40, 747.60 and 445.60 is: 668.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.40 : 747.60 = 445.60 : x
  2. Step 2: Convert to fraction form
    498.40/747.60 = 445.60/x
  3. Step 3: Cross multiply
    498.40x = 747.60 × 445.60
  4. Step 4: Simplify right side
    498.40x = 333,130.56
  5. Step 5: Solve for x
    x = 333,130.56/498.40
  6. Step 6: Final answer
    x = 668.40

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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.