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Finding the Fourth Proportional to 476.88, 657.78 and 280.45

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Solution

The fourth proportional to 476.88, 657.78 and 280.45 is: 386.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.88 : 657.78 = 280.45 : x
  2. Step 2: Convert to fraction form
    476.88/657.78 = 280.45/x
  3. Step 3: Cross multiply
    476.88x = 657.78 × 280.45
  4. Step 4: Simplify right side
    476.88x = 184,474.40
  5. Step 5: Solve for x
    x = 184,474.40/476.88
  6. Step 6: Final answer
    x = 386.84

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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.