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Finding the Fourth Proportional to 440.72, 660.64 and 258.16

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Solution

The fourth proportional to 440.72, 660.64 and 258.16 is: 386.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.72 : 660.64 = 258.16 : x
  2. Step 2: Convert to fraction form
    440.72/660.64 = 258.16/x
  3. Step 3: Cross multiply
    440.72x = 660.64 × 258.16
  4. Step 4: Simplify right side
    440.72x = 170,550.82
  5. Step 5: Solve for x
    x = 170,550.82/440.72
  6. Step 6: Final answer
    x = 386.98

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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.