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Finding the Fourth Proportional to 661.76, 912.96 and 579.68

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Solution

The fourth proportional to 661.76, 912.96 and 579.68 is: 799.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.76 : 912.96 = 579.68 : x
  2. Step 2: Convert to fraction form
    661.76/912.96 = 579.68/x
  3. Step 3: Cross multiply
    661.76x = 912.96 × 579.68
  4. Step 4: Simplify right side
    661.76x = 529,224.65
  5. Step 5: Solve for x
    x = 529,224.65/661.76
  6. Step 6: Final answer
    x = 799.72

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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.