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Finding the Fourth Proportional to 661.80, 992.70 and 572.70

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Solution

The fourth proportional to 661.80, 992.70 and 572.70 is: 859.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.80 : 992.70 = 572.70 : x
  2. Step 2: Convert to fraction form
    661.80/992.70 = 572.70/x
  3. Step 3: Cross multiply
    661.80x = 992.70 × 572.70
  4. Step 4: Simplify right side
    661.80x = 568,519.29
  5. Step 5: Solve for x
    x = 568,519.29/661.80
  6. Step 6: Final answer
    x = 859.05

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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.