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Finding the Fourth Proportional to 440.90, 661.65 and 258.10

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Solution

The fourth proportional to 440.90, 661.65 and 258.10 is: 387.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.90 : 661.65 = 258.10 : x
  2. Step 2: Convert to fraction form
    440.90/661.65 = 258.10/x
  3. Step 3: Cross multiply
    440.90x = 661.65 × 258.10
  4. Step 4: Simplify right side
    440.90x = 170,771.87
  5. Step 5: Solve for x
    x = 170,771.87/440.90
  6. Step 6: Final answer
    x = 387.33

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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.