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Finding the Fourth Proportional to 486.40, 728.32 and 457.60

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Solution

The fourth proportional to 486.40, 728.32 and 457.60 is: 685.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.40 : 728.32 = 457.60 : x
  2. Step 2: Convert to fraction form
    486.40/728.32 = 457.60/x
  3. Step 3: Cross multiply
    486.40x = 728.32 × 457.60
  4. Step 4: Simplify right side
    486.40x = 333,279.23
  5. Step 5: Solve for x
    x = 333,279.23/486.40
  6. Step 6: Final answer
    x = 685.20

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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.