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Finding the Fourth Proportional to 661.29, 912.45 and 381.48

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Solution

The fourth proportional to 661.29, 912.45 and 381.48 is: 526.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.29 : 912.45 = 381.48 : x
  2. Step 2: Convert to fraction form
    661.29/912.45 = 381.48/x
  3. Step 3: Cross multiply
    661.29x = 912.45 × 381.48
  4. Step 4: Simplify right side
    661.29x = 348,081.43
  5. Step 5: Solve for x
    x = 348,081.43/661.29
  6. Step 6: Final answer
    x = 526.37

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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.