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Finding the Fourth Proportional to 660.21, 913.05 and 571.79

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Solution

The fourth proportional to 660.21, 913.05 and 571.79 is: 790.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.21 : 913.05 = 571.79 : x
  2. Step 2: Convert to fraction form
    660.21/913.05 = 571.79/x
  3. Step 3: Cross multiply
    660.21x = 913.05 × 571.79
  4. Step 4: Simplify right side
    660.21x = 522,068.29
  5. Step 5: Solve for x
    x = 522,068.29/660.21
  6. Step 6: Final answer
    x = 790.76

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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.