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Finding the Fourth Proportional to 476.64, 657.36 and 393.84

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Solution

The fourth proportional to 476.64, 657.36 and 393.84 is: 543.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.64 : 657.36 = 393.84 : x
  2. Step 2: Convert to fraction form
    476.64/657.36 = 393.84/x
  3. Step 3: Cross multiply
    476.64x = 657.36 × 393.84
  4. Step 4: Simplify right side
    476.64x = 258,894.66
  5. Step 5: Solve for x
    x = 258,894.66/476.64
  6. Step 6: Final answer
    x = 543.17

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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.