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Finding the Fourth Proportional to 258.48, 389.70 and 240.86

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Solution

The fourth proportional to 258.48, 389.70 and 240.86 is: 363.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 389.70 = 240.86 : x
  2. Step 2: Convert to fraction form
    258.48/389.70 = 240.86/x
  3. Step 3: Cross multiply
    258.48x = 389.70 × 240.86
  4. Step 4: Simplify right side
    258.48x = 93,861.19
  5. Step 5: Solve for x
    x = 93,861.19/258.48
  6. Step 6: Final answer
    x = 363.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.