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Finding the Fourth Proportional to 476.86, 657.88 and 280.30

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Solution

The fourth proportional to 476.86, 657.88 and 280.30 is: 386.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.86 : 657.88 = 280.30 : x
  2. Step 2: Convert to fraction form
    476.86/657.88 = 280.30/x
  3. Step 3: Cross multiply
    476.86x = 657.88 × 280.30
  4. Step 4: Simplify right side
    476.86x = 184,403.76
  5. Step 5: Solve for x
    x = 184,403.76/476.86
  6. Step 6: Final answer
    x = 386.70

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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.