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Finding the Fourth Proportional to 655.44, 904.50 and 393.60

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Solution

The fourth proportional to 655.44, 904.50 and 393.60 is: 543.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.44 : 904.50 = 393.60 : x
  2. Step 2: Convert to fraction form
    655.44/904.50 = 393.60/x
  3. Step 3: Cross multiply
    655.44x = 904.50 × 393.60
  4. Step 4: Simplify right side
    655.44x = 356,011.20
  5. Step 5: Solve for x
    x = 356,011.20/655.44
  6. Step 6: Final answer
    x = 543.16

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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.