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Finding the Fourth Proportional to 660.24, 989.88 and 570

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Solution

The fourth proportional to 660.24, 989.88 and 570 is: 854.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.24 : 989.88 = 570 : x
  2. Step 2: Convert to fraction form
    660.24/989.88 = 570/x
  3. Step 3: Cross multiply
    660.24x = 989.88 × 570
  4. Step 4: Simplify right side
    660.24x = 564,231.60
  5. Step 5: Solve for x
    x = 564,231.60/660.24
  6. Step 6: Final answer
    x = 854.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.