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Finding the Fourth Proportional to 660.79, 912.18 and 412.45

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Solution

The fourth proportional to 660.79, 912.18 and 412.45 is: 569.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.79 : 912.18 = 412.45 : x
  2. Step 2: Convert to fraction form
    660.79/912.18 = 412.45/x
  3. Step 3: Cross multiply
    660.79x = 912.18 × 412.45
  4. Step 4: Simplify right side
    660.79x = 376,228.64
  5. Step 5: Solve for x
    x = 376,228.64/660.79
  6. Step 6: Final answer
    x = 569.36

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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.