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Finding the Fourth Proportional to 476.72, 657.89 and 280.40

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Solution

The fourth proportional to 476.72, 657.89 and 280.40 is: 386.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.72 : 657.89 = 280.40 : x
  2. Step 2: Convert to fraction form
    476.72/657.89 = 280.40/x
  3. Step 3: Cross multiply
    476.72x = 657.89 × 280.40
  4. Step 4: Simplify right side
    476.72x = 184,468.72
  5. Step 5: Solve for x
    x = 184,468.72/476.72
  6. Step 6: Final answer
    x = 386.96

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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.