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Finding the Fourth Proportional to 470.88, 708.48 and 278.64

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Solution

The fourth proportional to 470.88, 708.48 and 278.64 is: 419.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.88 : 708.48 = 278.64 : x
  2. Step 2: Convert to fraction form
    470.88/708.48 = 278.64/x
  3. Step 3: Cross multiply
    470.88x = 708.48 × 278.64
  4. Step 4: Simplify right side
    470.88x = 197,410.87
  5. Step 5: Solve for x
    x = 197,410.87/470.88
  6. Step 6: Final answer
    x = 419.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.