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Finding the Fourth Proportional to 661.29, 912.08 and 412.15

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Solution

The fourth proportional to 661.29, 912.08 and 412.15 is: 568.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.29 : 912.08 = 412.15 : x
  2. Step 2: Convert to fraction form
    661.29/912.08 = 412.15/x
  3. Step 3: Cross multiply
    661.29x = 912.08 × 412.15
  4. Step 4: Simplify right side
    661.29x = 375,911.71
  5. Step 5: Solve for x
    x = 375,911.71/661.29
  6. Step 6: Final answer
    x = 568.45

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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.